Although I do love to wear black, and I also use to have an all black office, I don't think I would recommend having an all black bathroom (I would suggest grey & white with accents in black). But, if a client really wanted it, I'd suggest:
Mixing the layers of finishes - matt, TeXtUrE, and SHINE.
Here I used a black on black damask print wall covering with shiney black wooden floors. Custom cabinets could be made from a pair of dressers or sideboards - using a black bowl vessel sink. Black crystal light fixtures for the sconces and the center piece chandy would set the romantic ambiance in the room... along with layering the light in the space with recessed lighting for task and candle light for romance. Open shelving, such as etegers would give added storage without being a heavy fixture in the space. With all the black first appearing so heavy (and masculine for him) I'd also lighten up the space with reflective surfaces such as mirrors, glass cyliners for candles & bath toiletries... and of course, some crisp fresh white roses (or orchaids or calla lillies).
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