What's something that's viewed as socially acceptable today that you think will become unacceptable 20 years from now?

Marriage is a stupid idea. Men and women have virtually nothing in common and make terrible partners. Men's lack of emotional sensitivity makes them incapable of providing a fulfilling relationship. Women don't have anything like the sex drive of men. At some point women turn off the sex tap, as is their perogative but society simultaneously frowns upon extra martial affairs. Cue brooding resentment. Scientists should hurry up and invent babies in a can or sex robots and solve the pressing problems of male-female relationships. Judeo-Christian values can eat my refuse.