A lot of Men would like to try to taste their own semen; however usually follow and do exactly what is outlined you too will be eating your own cum in no time.
Personally if a woman has been gagging on my cock for ten minutes and comes up to kiss me, I am going to kiss her back. But a lot of men think this is gross.
I've seen it in amateur gay porn videos, Edmund White mentions doing it in A Boy's Own Story, and (too much information?) I know I do it.