Could he possibly be gay or just really freaky?

I been dating this guy for awhile and we were drinking one day and I asked him what he thought about me licking his butt hole...he didn't say no to me as I kinda begged...so now when I think it over I'm wondering is he just open to do new things like this or could he be gay? He later told me he had no woman do this to him...
Hmm