I do like to do this... and have found that I really enjoy playing with my husband and a strap on. Gotta admit I was a little inhibited to try the strap on initially... not quite sure why. But i've found that it's incredibly erotic to use it with him, and there are so many possibilities for play that didn't initially come to mind besides just penetrating his ass with it. 'Cause it's like having my own penis for a while and getting to play with it any way I want
I also like teasing his ass with my finger while I'm giving him a blow job-- find if my timing is right it can really make him cum hard!