Yes. Hell yes.
I find it is a erotic sense of sharing! I'm a 'kisser' and love to give/recieve oral.
Admitantly, when I masturbate, I often taste the end result lol.
Oddly, lately, my newest lover of a few months, he will kiss me after he goes down on me, he said it's fine, but he refuses to kiss me after I go down on him. :-/
A slight touch of homophobia/sperm touching his mouth? Perhaps. But it is a slight turn off ('hard on killer') that he won't... Maybe a slight negling feeling of rejection I note in my heart... Which makes no logical sense I know, but kind of in the same boat, different seat! *shrugs*
At any rate, I like the smell, taste, erotic sense of sharing it brings to a sexual encounter!