The thrill of the chase is pretty compelling.
Some people gain immense gratification from the approval of others and sex is an extreme form of approval.
Many people are never satisfied with what they have. When they get something they want, their next thought is "what's next?" Got a promotion at work? Feels great for a while, but then you want another raise before too long. Rarely can we be content with what we have. Got a great relationship with someone you love? Wouldn't it be great to have something more than that too.
Non-monogamy needs to become more accepted by society. Too many families have been broken up by people's inability to remain faithful to their partners. If monogamy is linked (as some anthropologist believe) to a desire in men to ensure that their offspring is legitimate and a desire in women to ensure access to resources, then it makes sense for monogamy to become less prevalent as birth rates fall and women's incomes become comparable to that of men. Monogamy has become somewhat socially ingrained so it may take some time.
Some people gain immense gratification from the approval of others and sex is an extreme form of approval.
Many people are never satisfied with what they have. When they get something they want, their next thought is "what's next?" Got a promotion at work? Feels great for a while, but then you want another raise before too long. Rarely can we be content with what we have. Got a great relationship with someone you love? Wouldn't it be great to have something more than that too.
Non-monogamy needs to become more accepted by society. Too many families have been broken up by people's inability to remain faithful to their partners. If monogamy is linked (as some anthropologist believe) to a desire in men to ensure that their offspring is legitimate and a desire in women to ensure access to resources, then it makes sense for monogamy to become less prevalent as birth rates fall and women's incomes become comparable to that of men. Monogamy has become somewhat socially ingrained so it may take some time.