Dr. Weevil has an interesting theory on why the suicide bombers may have been drinking and using (visiting?? Renting??) strippers and prostitues, something we would think is in direct conflict with their religious views, prior to wreaking havoc on NYC.
The last-minute (or rather night-before) drinking and whoring is unsurprising, too, at least in retrospect, for a combination of reasons. It would help to close off the alternatives, as they steeled themselves not to turn back. It would provide a fresh and vivid reminder of what they hate (but can’t resist) about the Western culture they aim to destroy. (There’s nothing like a hangover to make one feel more homicidal.) Not least, it would give them a last chance to have some cheap, sleazy fun before heading for Heaven or oblivion, as the case may be.