can mutual masturbation, between males, cause STD's

Concerning possibility of transfering STDS:
Its possible, if your partner had infected fluid on his hand, that an STD could be transmitted to you when your partner masturbated you. However, STDs are not likely to be transmitted through mutual masturbation, especially HIV-Aids. It is much more unlikely that STDs spread through skin-to-skin contact would be transmitted this way.

STDs spread by Contact (skin-to-skin): HPV/Genital Warts, Herpes Simplex Virus (HSV), Molluscum Contagiosum, Chancroid, Syphilis, Crabs/Pubic Lice, Scabies.

Male masturbation FAQuestions and awareness videos...