I agree. I also think that sex is very different, much more intense and lasts a lot longer when my partner is dressed. Partly because the foreplay is so different and probably because of his excitement of being dressed and accepted and not feeling defensive or worried about ridicule. That in turn affects me and I can respond "differently".
You say "it seems like more lesbian-like." Is that you talking from your perspective as a male, or do you think she feels a little like a lesbian when you have sex with her while transformed?
Paige