Safe to kiss or have sex with someone who has mrsa?

Maybe maybe not: Mrsa is methicillin resistant staph aureus that in the community form tends to cause skin infections and abscesses. You are at risk in contracting MRSA with any form of close personal contact and or sharing of clothing or other personal items. It depends on where the MRSA infection is but generally speaking - close personal contact is the best way to acquire this sort of infection.