Still would be interested to know what modern progressives think goes into considerations of sexual morality apart from consent. A couple of comments have denied that consent is the only ingredient in their thoughts on the subject, but nobody has said what those other ingredients are.
I touched on some of those things on page one, and I'm working on a response to your question. Gotta go to work 
Such thinking has been around since the Garden of Eden. It's nothing new.
I do not understand this response in light of your responses regarding the historicity of Eden.
Abuse and manipulation are both facets of consent. If the person was intimidated or tricked, the consent isn't real. And abuse is tricky to define if there is genuine consent by everyone involved and none of them are being intimidated or deceived into consenting and the behavior remains within the boundaries of what was consented to.
Genuine, Christian sexual morality revolves around marriage, which obviously includes consent, but also includes a much broader idea of what is being consented to according to what husband and wife are to each other, to their own families and children, and to society. Sexual behavior in itself-- that is, the pursuit of pleasure via arousal and/or orgasm-- thus has a larger context within which it must fit, and if it can't fit within that context it is considered wrong, immoral, perverse, etc.
People with a 6th Commandment sense of chastity or "sexually pure and decent" to use our translation, recognize autoeroticism, pornography, hookups, premarital sex, sodomy, bestiality, swinger parties, prostitution, burlesque/stripper shows, etc. as sexual immorality even when done on a fully consensual basis. Modern progressives, however, using the 5th Commandment only, have to claim there is nothing immoral about these things as long as they are consensual. Or, if they sense there is still something immoral about these behaviors, they have to find moral objections based on flaws in nature of the consent, such as social power imbalances between prostitures and clients that blur the line between free consent and pressured acquiescence. That's how progressives can still claim (though they are faltering even here) to oppose pedophilia while accepting all the other things I mentioned. A child can't truly consent, even though those same progressive would say that same child can consent to getting an abortion.