Why? Here's the thing. Your daughter is probably already having sex (if she's 17+, American, and of a typical level of religious devotion). She's not being tricked into having sex, she'd having sex because she wants it. There's no reason to be more angry at a 50 year old having sex with your daughter than a 22 year old, and certainly no more reason to think you'd be justified in maiming anyone.
I remain where I started with one small change, in a case like that, daily prison rape would be acceptable, though I would also be okay with letting the victim (which note, is in no sense the daughter from what I see in the story), cut off his attacker' balls, and then send the attacker to a rape-free prison.