Word. He probably was curious, but that doesn't have to mean he was interested in any one-on-one with you, or even that he's "bisexual". Think about it from the point of view of innocence. When you were a kid anything sexual probably mesmerized you, right? Had you ever participated in group sex prior to this? I bet he hadn't.

And truthfully, take it from someone who does like cock...yours IS kinda nice to look at.