Welcome to my perfumed garden

American bathtubs are much smaller and shallower than in England. The first time I visited there, I was stunned at the size of the tub in what was a pretty non-luxurious hotel room. Your guy would not be able to stretch out in an American tub.

I also think it's a time/efficiency thing. American men jump in and out of the shower. Also, in American advertising, baths are depicted as more of a female relaxation thing. (I'm thinking "Calgon take me away" for any Americans)

So, IMHO, Blair would take a bath to ease muscle aches. There are also some nice stories where Blair taking a bath (and Jim bathing him) are very symbolic. Blair taking a bath - ummm works if it has some sort of ritual connotation. Otherwise, not so much.