Couples yoga can be fun. You get strength and flexibility work, but it is more than just doing the exercises together, as it tends to be a style that promotes connection, and communication and trust.
Please note that I am not talking about ‘sensual’ or ‘intimate’ yoga…. just a style of yoga practice in which the stretches and holds are done in a way in which two work together. You do need to read the description of what is in the book or dvd carefully to make sure you are getting what you want.
Ganga White and Tracey Rich taught partner yoga back in the 70s, and I have their book, but I don’t know that it is still available. However, there are a number of books and videos one can get. Actually they are in Santa Barbara, if you are ever out that way.
It probably makes sense not to tackle it without at least some familiarity with yoga generally, and particularly helpful to do a workshop with an experienced teacher first.