Chinos right prostitution is cheaper and probably more interesting to some when you add up the whole marriage deal.
Sad but true. If you are all for a loving relationship and willing to risk having a sex life that will be a bit more limited and every once in a while and also the risk of getting everything snatched away from you in divorce (divorce rates are as high as 50% of marriages according to most surveys/studies) and end up in the street, then go for it. In the long run, prostitution will be cheaper and the sex experience will be way better than with the typical gf/wife.