Save Water – Shower together!
Turn down the thermostat – Stay warm by snuggling!
Borrow books from the library on massage and practice on each other. When you find one you really like, then you can buy it (this prevents books from sitting on your shelf not being used)
Bought a massage/sexual book you didn’t like? Offer it to a friend, or sell it to a used book store.
Just because you want to be good for the environment doesn’t mean you have to give up things. It just means looking for the better choices.