Sex is always fun and satisfying. At least for me. I try not to ask if the woman is satisfied. Just in case I don't like the answer. When it comes to this, I believe in a 'don't ask, don't tell me' policy.
Sex is also relatively inexpensive.
For instance, handcuffs will last forever and I've been told that whipped cream and chocolate syrup can also be used as dessert toppings. So it is relatively inexpensive. Unless of course you have to pay for sex. I imagine that would get costly. But then again, if you figure in the cost of dinner and a movie before sex and the cost of flowers or gifts after sex, we all pay for sex one way or another.