Id recommend desexing your girl bun asap. and house them next door to one another so they can smell and see each other.
They will get used to each other this way. Too much humping from your boy bun could depend on how long ago he was desexed, his hormones could still be going crazy. its normal behavior but i wouldnt let him do that constantly to her. after all, she was the first bun of the house, so at this time its her domain. and you dont want her to get upset or angry. bunny bites can be very nasty.
When i brought Smudge our rescued lop home, and our girl bunny was already desexed.) we would only do short supervised introductions of 10-20 mins each time. we housed them next to each other for 2 weeks (until we felt confident to leaving them together), and then they moved in together. just dont rush the process, check out http://www.rabbit.org/faq/sections/introductions.html
good luck 