I responded here before, but I think it got wiped when the server goofed. Anyways, yeah I'm an SO to a mtf and tbh our sex life got a lot better after she came out. But our situation is a bit different. We have never had penetrative sex. We tried once and she basically had a melt down. She is just unable to use that part that way, which is totally cool with me. We've been a couple for ten years now, and I think the first 4ish were not sexual, but emotionally based. She has always identified as asexual, and so I left it at that until my sex drive peaked at around 21. That was around when we started experimenting sexually. I also think we were pretty screwed up from our upbringing and sex was just such taboo topic, it was weird to talk about at first. But as we gradually went out of our comfort zone, it has gotten a lot better. So when she finally did come out to me as trans, it explained so much! Since then, we've been able to discuss what is okay and what is not okay and I think our relationship is stronger and better than ever, emotionally and sexually. We are more of cuddlebugs to be honest, but sex is still something that we explore. So from my perspective, it is easily worked out with communication... though it probably helps that I'm not necessarily straight either. There is so much more to sex than just penis + vag penetration. There are a lot of toys out there and different ways to experiment. Though if you truly identify as a straight woman, this might be a harder situation, it might at least be worth trying... don't knock it till ya try it! Good luck, hun!
