Hahahaha, I like how you worded that… at first I chose "once in a while," but who am I kidding lol.  I chose that and also "if I am horny enough" (which is always the case in bed).

There's just something intimately hot about cumming inside someone or having someone cum inside you. I remember reading something about their DNA being forever a part of you, and I think that's cool (or hot) -- provided you have sex with someone you like and trust, that is.