I love to read books that combine genres, and some of my favorite romance series combine romance with science fiction or fantasy. Not all of these novels take place on another planet, but they do borrow science fiction elements, like space travel, or fantasy elements, like the use of magic. If this genre mix sounds appealing to you, try some of these:
Links:
[1] http://www.hcpl.net/users/linda-stevens
[2] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=robin%20owens&index=.AH#focus
[3] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=heart%20mate&index=.TH#focus
[4] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=jayne%20castle&index=.AH#focus
[5] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=after%20dark%20castle&index=.GH#focus
[6] http://www.youtube.com/user/Writerspace
[7] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=gena%20showalter&index=.AH#focus
[8] http://catalog.hcpl.net/ipac20/ipac.jsp?menu=search&aspect=subtab13&term=heart%20of%20the%20dragon%20showalter&index=.GH#focus
[9] http://www.hcpl.net/taxonomy/term/37