Thanks, Grace. This information is very useful for me. I've read that mutual masturbation is concerned with syphilis risk. People say that the risk is, only when there is a contact with syphilitic sore. But if that sore could be in woman's vagina and my fingers could contact with it...
mutual masturbation is incredibly low risk. You can transmit herpes , hpv and molluscum through direct skin on skin contact - ie the outercourse that often goes a long with mutual masturbation but the risk of transmitting those are so low that we don't recommend testing for that either.
grace