Whether you're gay or not depends entirely how you want to identify yourself.
Also it's perfectly acceptable to enjoy the homosexual encounter and still be straight. The actual nerve endings in your erogenous zones don't discriminate when they are stimulated by something. It's entirely possible for a gender your don't find attractive (or people of the gender you like but are themselves unattractive) to stimulate you enough to get an erection and possibly even bring you to orgasm.
No it doesn't make you gay/bi unless you choose to identify as such.
Also it's perfectly acceptable to enjoy the homosexual encounter and still be straight. The actual nerve endings in your erogenous zones don't discriminate when they are stimulated by something. It's entirely possible for a gender your don't find attractive (or people of the gender you like but are themselves unattractive) to stimulate you enough to get an erection and possibly even bring you to orgasm.
No it doesn't make you gay/bi unless you choose to identify as such.