Bisexual maybe??

Caught my husband watching bisexual porn, we both enjoyed porn, it's very normal to us, but usually nothing like that. He ask me 1 time to put a finger on his ass and that day he came like I've never seen. Now after a few months I've found bisexual porn on his phone, does that mean he wants that? I mean between us it's fine but not outside the bedroom with someone else.. Should I ask him straight up or ignore it?