These are quotes from article I red recently, written by Professor Janet Smith.
Professor Janet shows the crippling effect of the contraceptive culture on our relationship with God, our romantic relationships and marriages, the culture at large and our physical and mental health.
The link to the whole article you can find on the bottom of page.

Monkeys and Contraception

There is an amazing study reported from a book by a man named Lionel Tiger. Lionel Tiger is an anthropologist who studies animal behavior to explain human behavior. Lionel Tiger works with a colleague named Robin Fox, who also is an anthropologist who studies animal behavior to explain human behavior. He works at Rutgers. In the 1960s, as he saw contraception becoming more and more popular, he speculated that male/female relationships would change radically. He did a study in the early 70s that involved a tribe of monkeys. The alpha monkey of this tribe, named Austin, chose three female monkeys to be his exclusive sexual partners. Austin had a grand time with these three female monkeys. Then the researchers injected Austin’s three females with the contraceptive Depo-Provera. Austin stopped having sex with them and chose other female monkeys to be his sexual partners. Then they contracepted all of the females in the tribe. The males stopped have sex with the females and started behaving in a turbulent and confused manner.

Male monkeys at least evidently prefer intercourse with fertile females. Studies also show that males — human males — produce more testosterone when they are around women who have fertile cycles. In fact, men are more attracted to women when they are fertile and women are more attracted to men when the women are fertile.

Once when I mentioned this at a talk in Kansas, a man came up to me and said, “In Kansas, we don’t need studies to show that males are more interested in females when they’re fertile.” He said everyone in Kansas grows up on a farm and we know that when a bull is in a pen with a cow who is not fertile, he is not at all interested. But if the bull is in a barn a mile a way with metal fences in between, the bull will get to the cow when she is fertile.

Tiger speculates that one of the reasons that women are dressing so immodestly is that they’re not attracting men because of their fertility. They have to do sort of bizarre things in order to attract a male. They aren’t attracting them simply by their fertility since they are not having fertile cycles.

Tiger also reports on a study involving tee shirts. The study included two groups of human females, one contracepting, one not contracepting. It also involved a group of males who had been rated for their evolutionary desirability. Men who are evolutionarily desirable are healthy and aggressive and responsible; the other group included those who can’t hold a job, etc. These men all wore a tee shirt for a day. At the end of the day the women smelled the tee shirts. Without meeting the males the non contracepting women chose the evolutionarily desirable males as potentially attractive mates; the contracepting women chose the losers.

The Magic of Sexual Attraction

There is some really good news for the ladies. One article reports:

They say female chemical messengers, known as pheromones, may help dupe men into thinking plain women are more attractive and beautiful women are less attractive than they actual are. Pheromones, the colorless, odorless chemical signals given off by the body, are thought to affect behavior in both animals and humans at a subconscious level.

This study involved showing men pictures of super models and having them rate the women for their attractiveness. Of course, they found them to be very attractive. Then they took something soaked in female fertile hormones and put that in the same room with the men. We exchange hormones through the sense of smell, although they have no discernable odor. Next the men viewed pictures of average women and under the influence of the fertile hormones, found the average women more attractive than the super models. Women don’t seem to realize that they are naturally attractive to males and that using contraception works against, not for, that attractiveness.

Let us recall that whereas contracepting couples divorce at the rate of about 50%, couples using natural family planning almost never divorce. It seems men living in households with women who are going through fertile cycles are less likely to stray. In fact, the men I know to be in marriages that use natural family planning are what I want to call very married. They do not look around. They are not interested in anyone else. They are very satisfied in their marriage.

After one of my talks a woman came up to me and she said that when she converted to Catholicism she stopped contracepting and started using NFP. She mentioned that many of her friends who were still contracepting complained that their husbands were having a problem with masturbation and pornography. She said none of her friends who use natural family planning complained of that problem. I think there is a reason. Again, I think the men living with women having fertile cycles are having satisfying natural sex. Men having sex with women who are contracepting seem to be turbulent and confused.

Babies are Bonding.

Babies are bonding. It takes 23 male chromosomes, 23 female chromosomes to have a baby. Two really do become one in a very physical and profound incarnational way. Not only one physically, but much more than that, since they have brought into existence a new human being who has an immortal soul. You have an immortal connection with someone with whom you’ve had a baby.

God Creates Every Human Soul

Conception is an astonishing thing for it involves a creative act by God. A sperm does not have an immortal soul. And an egg does not have an immortal soul. But human beings do. So where did we get that immortal soul? We didn’t get it from the sperm. We didn’t get it from the egg. Only God can create a human soul. And when God creates a new human soul he does what he did at the beginning of the universe. He brings into existence something that did not exist before. He makes something out of nothing.

There is no storeroom of preexisting souls. It is very important to realize that God created your soul and the soul of every other human being individually. He willed you into existence. And he wants you to exist for eternity. He entrusts babies to spouses. He is saying: “This soul belongs to me. I want this immortal soul to be part of the loving community that I am setting up for an eternity. And I’m giving this baby to you to do the best that you can to raise up to be a citizen of the heavenly kingdom. Certainly this person has free will and I don’t expect you to make any guarantees. But I want you to do the best that you can to return this baby to me.”

When spouses are engaging in an act of sexual intercourse during the fertile time of the month, they are sending an invitation to God to create a new human soul. When sperm meets egg he answers that invitation. He answers that invitation if it’s made through rape or if it’s made through in vitro fertilization. He honors the rules that he has set up. He doesn’t want babies conceived through rape. He doesn’t want them conceived through in vitro fertilization. But when sperm meets egg, he says, “I’ve set up these laws; I’m going to respect them. But what I want is human beings to be responsible. They should be sending me an invitation only when they are prepared to accept the gift of a child.”

link to whole article: http://www.catholiceducation.org/articles/sexuality/se0002.html