My points are in fact very relevant. You just can't seem to come to grips with the reality that 18 years old is old enough to make sound, independent judgements and decisions where sex is concerned. Period. This position of yours, in and of itself actually contradicts the 'Her body, her choice' philosophy (in the context of female adults) that you so ardently advocate for sex workers.The points you raise are irrelevant to this topic. You are trying to raise ten different topics that are not inclusive with each other. Brilliant red herring tactic, I will grant you that.
You'd rather paint the OP unjustly as a predator, rather than acknowledge the young woman, in her capacity as an adult, made an informed, rational, independent decision to sleep with him. Just as adult sex workers do. Some of whom do so with clear, informed, and deliberate intent at the ripe old age of 18. Are you suddenly challenging this concept, and are now proposing some form of regulated limitations to this philosophy? (as Jessica has suggested)
Unfortunately, your conflicting views on how old a woman needs to be to make an adult decision about sex don't support a consistent argument across all discussions of age of majority. Hence the fly in your oinkment.