Ambience of the bathroom
The best thing to experiment about the bathtub is the ambience around it. You may keep tinkering with the lighting of the bathroom and see what is more likeable for you. In order to spend some relaxing time in the bathtub, it is highly recommended that you have dim lights. Sharp lights can be very irritating in the bathroom.
There is nothing like candles, as they give a very natural look to the atmosphere. Have little candles on the side of the tub if you feel that artificial lights are not exciting you any longer.
Other than that, to add spice to the bathroom, you can have music, which should not be too loud. Instead of listening to pop songs, you can switch to slow romantic music in the bathtub, which will help you get mentally relaxed.
Mix different things in the bathtub
In order to make your bathtub more luxurious, you can add different things in the tub. Squeeze some oranges and oatmeal in the tub and mix it properly. On another day, you can add rose petals and scented oils in the bathtub, which is going to make you feel extremely special.
Ask your spouse to come along in the bathtub
Spending time in the bathtub alone can be very boring after some days. In order to make it more thrilling and romantic, ask your spouse to come along in the bathtub. You can also share a nice drink in the tub.