Elena kissed her hot neighbor. He also happens to be Tracy's sociology partner.
Ben kicked the crap out of Randy-frat-boy. Felicity was mad till Ben said he wanted things back the way they were, and showed her he bought her painting at an art show. He went out to get condoms or something
and then Randy's bros came along and kicked the crap out of Ben.
Richard isn't gay, he's just a virgin, in the most extreme sense. He had never even kissed a girl so Molly kissed him.
(Guys might want to stop reading here)
Sean had testicular cancer and kept hiding it from Megan, till she picked up the phone & it was his doctor. He had the testicle removed and it hopefully went well. He and Megan are the best thing on the show, in my opinion.