And your reply shows that you have a fundamental misunderstanding of love; or, rather, how love is expressed.  Love is unselfish.

I understand your confusion because sex feels extraordinarily good and evokes emotions in us, e.g., of feeling wanted, of euphoria, of dominance (for some), of openness, etc... that contribute to that good physical feeling.  And when you do it with someone you love, like anything you do with someone you love, it's better.  I think we FEEL LOVED when we have sex, and that's perhaps where the confusion lies.

I'm going to qualify my comment about sex being purely lust driven, and say that it is also need driven.  You think you have sex because you love; I say you have sex because of lust and of feeling loved.  

But while we can FEEL being loved; that is not the same thing as LOVING someone.  Jesus commands us to LOVE not to REACT to love.  

Homosexual "love" is that way; someone makes them feel a certain way and they think it's love, when it's lust or envy.