If your partner has a history of genital herpes (and you don't), you'll need to avoid intercourse and other genital contact for the entire third trimester.

http://www.babycenter.com/0_when-you-might-need-to-say-no-to-sex-during-pregnancy_745.bc

An outbreak of genital herpes or feel one coming on— in you or your partner.If your partner has a history of genital herpes (and you don't), you'll need to avoid intercourse and other genital contact for the entire third trimester, even if he has no sores or symptoms. The same applies to receiving oral sex if he has oral herpes (cold sores).