wanting to experiment with prostate stuff does NOT make anyone gay. Sure, get toys! Especially the one called Nexus, supposedly much better than the Aneros. DO NOT get any stupid jelly toys. ever. they're toxic. Only 100% non-porous silicone, glass, metal, or hard plastic are acceptable.
do *you* like having a g-spot orgasm? well.. so does he. nothing gay about it whatsoever. And as Fras said, the fact that he couldn't tell you is bad, bad news. He thought you'd reject him. Hiding what gives you pleasure from your partner.. that's the first step on the road to cheating. He (apparently rightly) thought you'd think he was gay. c'mon you know he's not gay, and even if he's bi, so what? In future, make sure he can tell you anything without judgement, and vice versa.