I never played Mass Effect, but that just seems funny. Haha, poor male shephard trying his moves on someone of who he doesn't realise is a lesbian. Am I the only one who sees the humor in this? 
(sorry for replying to such an old post)
Think about it from the perspective of a woman who only likes women, who has grown up in a society that tells her that she should make herself appealing and available to men, EVEN when identifying as a lesbian, and it's not that funny.
Sam Traynor isn't a terrible character, but everything about her sexuality seems tailored towards titillating male gamers, even if in a "humorous" way. It isn't so funny to hear Traynor gush about how much she loves vibrating phallic objects..even Kahlee Sanders' used sex toys, wow, thanks, Weekes, I really feel that you aren't there for the "straighties".