They're both deviant behaviors looked down upon by the mainstream for the permanent emotional harm they cause to the people involved.
You cannot equate "Would you marry an ex-child molester?" and "Would you marry someone who has had casual sex?"
Cannot.
CANNOT.
One raped a fucking child, dude. RAPED. A. CHILD. Another had a consensual relationship with another willing adult. You cannot and should not equate the two just because you happen to disagree with both. That is plain and outright creepy.
I hope you're a troll. Seriously.
I just read the rest of this thread and time_management is an idiot that probably SHOULD be seeking therapy.
Or could be a 17 year old who slept with a 15 year old, if using a legal definition.