The main function/reason for having sex is reproduction so you can increase your fitness by contributing more genes to future generations. Humans differ from other animals in that they have sex for pleasure as well, and not always for reproductive purposes. Now these two reason are of pretty common knowledge. According to the article "Why Do People Have Sex?" based on research by David Buss and Cindy Meston, found on Science Daily, people have sex for many more reasons then just these two.
Buss and Meston uncovered 237 different motivations during their studies. Like we all know humans tend to be the exception to the rule when it comes to thing like sexual selection. People are the only creatures that do things for spite, and people can be spiteful during sex as well. One of the reasons that someone might be motivated to have sex with another person is to give them a sexual transmitted disease. This does not increase the fitness of either individual and it might also decrease the fitness of both individuals. If a person is trying to give someone an STD they have the possibility of gaining another STD from the person they are trying to harm. This whole spite things sounds pretty awful but people have sex for selfless reason as well.
I wouldn't necessarily call this altruism, because the other individual ultimately gains something from the experience, but it seems very close. Some people said that they had sex to tell someone thank you or to make that person feel better. People also have sex for selfish reasons as well, some people said that they had sex to get a promotion, or to become more popular.
It seems like if you can think of a type of mood people probably have sex because of that mood that they are in. People have sex because they're bored, they want exercise, they are angry with someone, they want to make up after a fight, they are sad and want to feel better, or they feel insecure and want to try and convince their partner to stay. Some people also have sex if their partner pressure them enough to do so.
It's interesting that people have found so many other ways to utilize the act of sex for reasons other than producing offspring. In the end there is always a chance that any of the times that anyone has sex whatever their motivation may be, they have the possibility of successful fertilization.
So a question to ask is, is it evolutionarily adaptive to have sex for all of these different reason? I think that the answer is yes. The more you have sex the better chance you have of producing offspring no matter how much protection you use since nothing is 100% effective.
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