" Shatterstar himself claimed that even though he was fully capable physically, he had never felt any sexual stirrings or romantic love—indicating a form of asexuality - and has long felt "lacking", even in his native dimension )X-Force Volume 1 #42)/It seems quite clear that this is no longer the case given the kisses he has shared with Rictor and Boom Boom recently (X-Factor Volume 3 #45 and Nation X- X-Factor #1). "Kissing someone does not mean you are sexually attracted to them.
Furthermore, the kisses with both Rictor and Boom Boom are looking more and more like experiments for Shatterstar. My guess, he's finally got to the point where sexual feelings are awakening and he doesn't have a set preference for anyone person, no matter if they are male or female. He's very similar to Longshot in the 80's. Dazzler believed the two was mutually exclusive but he would often kiss or flirt with Rogue because there was attraction there. Also, Shatterstar did grow up with the values most Western cultures grow up with - he's an alien just like Longshot and while Longshot was naive socially it looks like Shatterstar is naive sexually. I ultimately hope he chooses Rictor - even though Rictor is obviously bisexual (he's had sex with at least Rahne and I assume others), he'd understand Shatterstar sexual desires more than say Boom Boom who is exclusive to the disco stick.