Given you are still emotionally charged toward women you are by all accounts bisexual as would apply to a man (just as much) who has been gay all his life having sex with a woman and appreciating it for the sexual pleasure.

If you desire and/or perform that same act with another man giving or receiving despite no further emotional connection you are engaged in homosexual sex which like any other kink doesn't define who you are as a whole. There is no one sex act that is inherently homosexual until you desire it of or from the same sex meaning that being pegged by your girl or slipping a cock shaped dildo up your ass is just another way of getting off. To elaborate requires semantics and not merely labels (as others may say), but a real defining of what is of what it is? Being gay or straight exclusively is a lifestyle decided at birth that is discovered during our coming of age before we can put a name to it that involves the deepest parts of our emotional connections.