If you try it with an open mind, you might find you enjoy it. Cumming from a prostate orgasm is a totally different feeling. Doesn't always happen and nice thick cock that puts pressure on the prostate helps. But even when you don’t cum it can still be a very pleasurable experience to get fucked. You don’t have to be submissive or gay. I’m bi but Im far more attracted to women but I love getting fucked.
My first sexual experiences were all same sex but I’ve never wanted a romantic relationship with another man. So don’t let that worry you (not that there’s anything wrong with that). Getting fucked ISNT going to turn you gay or mean that you like women any less but if you enjoy it, it just means you may have a bi side. Just see it as giving you more options for pleasure and if it turns your wife on too, so much the better.
James