While minimizing their chances of being reported to police.
1. Go out with a BYU student
2. Convince her there's been an honor code violation, however slight (say he's in her apartment 1 minute past curfew). Let her know she'll be kicked out of school if she reports.
3. Proceed as you will
The big problem with #2 is it's not an empty threat, this article shows they really will get the boot if they report.
Perhaps most importantly, there doesn't have to be any honor code violation, the predator just has to convince the girl there has been.....in a scenario like that, I really feel for the victims......