Money and care for them does the job.I don't know how it is in Japan but I read long ago that in some Scandinavian country you can just offer her money and she would say yes or no. She won't slap you.
Genius. Would never have thought of that.Its quite simple. You both get in the same bed, and pretend to be asleep. Then, sleep will occur. Congrats! You have now slept with a college girl.