Why can I not say a b'racha before taking a regular bath at home? I understand, in such a case, a person might be "immodest" and the bathroom is, well, a bathroom. But still, I do feel a similar sense ...
"Just as one separates oneself from excreta, urine, a foul odor, a corpse and the sight of nakedness for Kri'at Shema, so too, he should separate himself for Shemoneh Esreh". (Rambam. Hilchos Tefillah ...