For god's sake guys, other species only mate at certain times in the year because of their menstrual cycles which only allows them to ovulate at a specific season. Therefore, I'm guessing since less evolved species are more concerned with simply having babies than having sex for the fun/pleasure of it, then it only makes sense that someone would assume that other species don't enjoy, which is wrong of course, but still.
Hormones make sure you enjoy it, otherwise every species would have gone extinct in no time (bacteria must have sex like 5,000,000 times a day... lucky)
It's supposed to feel good?
because its quite an effort getting pregnant and giving birth, as well as feeding the babies. So Mr. Nature tricks us to having sex and pay for the price later.
In humans it has a role of creating a strong long term bond between partners as well as for procreation. This is important because the father plays a significant role in bringing up the child.
I think I need sex, right now.