A survey conducted by the University of Texas found 237 reasons. According to this article in the NYT, [1] “They even found a few people who claimed to have been motivated by the desire to have a child.”
The number one reason was “I was attracted to the person.” On the other hand, defensive sex is also popular:
[B]oth sexes seem to practice a strategy that he calls mate-guarding, as illustrated in one of the reasons given by survey respondents: “I was afraid my partner would have an affair if I didn’t.” That fear seems especially reasonable after you finish reading Dr. Buss’s paper and realize just how many reasons there are for infidelity.
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