Is sex better with someone you lust for or with someone you love?

Me personally find, I find sex with my fiance to be both... Especially due to our son, as sex is not as often as it used to be, I not only love my girl but also am lusting for her by the time we do it...

But apart from me, have any single people found the sex from a one night stand to be better than the sex they have had with someone they loved???