I should point out, you are under no obligation to accept his behaviour.
Nor should you feel pressured to put up with something that makes you uncomfortable.
Which is why I asked if it was something you felt able to discuss.
Whilst I don't see his behaviour as particularly out of line, it is for you.
Sexual preference isn't really something that is easily changed, and so long as your not hurting anyone there's no need to.
What needs to be established, is can you live with this having happened and now hovering over you.
As has been said, you know what is acceptable for you within the bounds of a relationship. I suggest you stand by that.
Not everyone is compatible in all respects, but this is what we learn by being involved with someone. It's a constant learning curve, and experience for growth.