You don't have to be, but if you aren't in love with them it's just a bodily function. It is so much more than that when you have that deep connection of love and mutual respect. If you have any morals at all, intercourse without emotional attachment merely leaves you feeling guilty and alone.
What a bunch of nonsense answered to a very dumb question. Think of it this way loser, what if the female in this situation was your daughter? ( a legitimate daughter, not one that you had out of lust)
I agree with Farmer GirlMaryJo on the emotional issue. But as far as the morality of the subject, I have a different view. I think it's fine IF and only if:
You are both consenting adults You are both RESPONSIBLE! That means understanding your own bodies, understanding what consequences might come from sexual activity, and knowing how to prevent those consequences from happening.