Speaking from experience, I also have Spina Bifida and I have no feeling from the knees down, that doesn't mean I should be treated any different than that of someone with full function. I enjoy it as much as the next person, but it also makes me off the charts sensitive. If anything, I would just say that when you're playing with someone who has a disability, there has to be absolutely no grey area about boundaries and safety precautions, as people with disabilities are less likely to be able to fight back (Been there, and it's the scariest position I have ever been in and because of it, I will never let myself be in that position again). That being said, I agree with everyone else, if it's consensual, I don't see a problem. The worst possible thing you could do to someone with a disability is treat them like they're going to break or treat them any different than you would anyone else. We ALL just wanna feel like we belong at the end of the day!