Orgasms. Males can't orgasm more than once in a sexual intercourse because after the orgasm, the morphine produce by your body goes out, without the morphine, men would not be able to orgasm because...
Yes. Many women have multiple Os. :)
Yes. If he is in the mood and wants to learn how it is possible. In my younger days 4 times was possible, but the fourth time really wasn't worth it.
I'M A TEEN AND i DID IT 4 TIMES ONE DAY BEFORE YEARS
Yes.