The thing is that power exchange isn't about one person taking another's choices away, it's about the the sub's surrendering certain freedoms. The ability to physically force dominance on another should never be an issue ... it brings into question the entire concept of SSC. If a dom tries to take away a sub's freedom to choose whether or not to submit, that dom is not engaged in power exchange, he/she is engaged in rape ... or at the VERY least, abuse.