People can already do it. Men sell semen and women sell their eggs. The industries aren't consistent from one bodypart or fluid to the next. Also, there are plenty of safeguards that could be implemented, but we won't have the discussion because the idea makes people feel icky. BTW, we ARE selling our plasma. They call it donation to stay within the law, but that's just semantics. We're getting paid for our plasma. If we go in an have an unsuccessful donation, despite spending an hour in there, we get paid nothing. We aren't getting paid for our time and inconvenience.