I really enjoy it, and I have a male partner. Now if you think of yourself as a straight guy and are kind of uncomfortable with the idea of being a gay dude you may be even more turned off by penetration.

Personally though, thinking of myself as a gay guy I know I would like topping but I would also like bottoming too, so I don't see anything wrong with being penetrated. And the gay cisguys I know say they would use a vagina if they had the option of that or their butt because they could avoid the preparation and sometimes discomfort.

Not all guys would agree, but looking at it that way may help.

Anything you like that is SSC is fine; do it, bro.