The movies and television have a way of making a romantic bath for two look so romantic and comfortable, when in reality it can be very crammed and uncomfortable for a prolonged period of time.
However, if you want to be able to have relaxing baths with your significant other without feeling like your're packed in a sardine can, you may want to consider upgrading your tub to something along the lines of this:
This two person tub is deep and made to give you both maximum comfort and space to do your thing. Also, notice how the headrests are positioned so that you are at opposite ends, allowing you to have a comfortable conversation with out having to crane your neck around? This is such a great bath fixture, and in my opinion, a necessary upgrade.