if they can feel eachother have sex then yeah, the Orgy-like scenes mean they're all Bi not Gay(the fact that said scenes are portrayed as an Orgy further stresses that), I mean it's pretty damn clear they ain't monosexual if they're having psychic Orgies with eachother
I might check it out but the fact that it's by the Wachowskis (and they're a similar brand of hack writers to M. Night Shyamalan) makes me cautious of it
edit: occording to all sources I can find becoming sensates did not change anyones sexualities....so I'm gonna assume the Orgy scenes are just to make the show "edgy"
edit: scratch that, Lana Wachowski confirmed that becoming a Sensate changes your sexual orientation and makes you Pansexual
so no, they aren't Gay, and yes, the show is Homophobic