Been there, done that. I could push him anywhere I wanted to go! Seriously though, I did date a guy (a very long time ago) who was a quadriplegic, the wheelchair was never an issue. I dated him because of who he was...a really great person.
we didnt really date, she was a very pretty woman who was 27 when i was 17 and she was very "hungry" if you know what i mean. anyways she was only temporarily disabled but when we were in the midst of our fling, she was still using her wheelchair. we "did it" together when she was disabled and after she got better. she was great in bed.