Eh, sexual orientation is irrelevant to me now. It's something societal anyway to stay in touch with the "norm". I've met plenty of guys that are "straight" and are easily impressed by a big cock. I don't think that's such a big deal. In fact, I ended up checking out a video where a guy with a really big cock was getting a blow job from a girl. While this was happening, his guy buddies were standing around making comments about his size as casually as guys would talk about Football.
I wouldn't worry about it.