I wouldnt call it romance, but alot of Joe Haldemans novels have sappy "get the girl in the end" endings which i like. alot of Heinliens later works deal with free love.
Both authors are very funny to read, and i plough through their novels whenever i pick them up.
are the haldeman books ive read, all of them have that kind of attitude, all of them i finished within 48 hours of picking it up.
http://www.librarything.com/catalog....earch=haldeman