I'm honestly not too surprised that Ray Comfort doesn't seem to understand the concept of "consent." That seems to be a feature of the religious right's mindset, not a bug.
See, they don't actually see sex as something taking place between equals. In their worldview, it literally can't. See, the ONLY proper context for sex is between a man and his wife in the marriage bed, and in fundamentalist religion, women and men aren't even remotely equal. The wife is essentially the property of the father until he chooses to give her away, at which point she becomes the property of her husband. She doesn't have the power to withhold consent--notice the fire from the far right any attempt to pass or enforce spousal-rape laws inevitably draws. Women aren't afforded much more status than children, who are ALSO seen as the property of their parents--their father first, then their mother. The only equal adults who can exist would be two men, or two women--and both are kinds of relationships which are decreed strictly forbidden. Sex is something done to you, or that you do to someone, and not something both partners participate in equally.
I honestly think that a lot of the right's behavior stems from this glitch--regardless of what they may say, they encounter what amounts to a "divide by cucumber" error when they try to wrap their minds around the concept of "mutual adult consent."