Safe sex is not only about using physical protection. It's about consenting to what will happen in the bedroom.
Now what is really funny here is that he Women's Junior Anti-Sex League has come up with a godsend to PUAs in the form of Consent. "Game" is based in Salesmanship. There is a reason that the Traveling Salesman is a sexual stereotype.
And trust me. Every salesman knows about the power of, "yes." Get someone to say, "yes," enough to times and before either of you know it she is consenting to things that she had no intention of ever consenting to under any circumstances.
"Of course it hurts baby but you did consent to this repeatedly."