Change to red exposed brick, dark rust coloured stone floor tiles, and stone tub interior and I'm SOLD! Love the floor inset bathtub! Must have comfortable lounger seats in it tho, not public pool hot tub bench style seating.
To get an impression of romance in the bathroom you have to create an atmosphere. The right atmosphere will create a strong romantic impression. Here are some pictures which could serve as inspiration to create a romantic bath for you and your partner.
30 Extraordinary Sinks That You Will Not Find In An Average Home