Non-penetrative sex A range of sex acts called "non-penetrative sex" or "outercourse" can significantly reduce STI risks. Non-penetrative sex includes practices such as kissing, mutual masturbation, rubbing or stroking. However, non-penetrative sex may not protect against infections that can be transmitted via skin-to-skin contact, such as herpes and human papilloma virus. How to put on an external condom External condoms can be used to cover the penis, hands, fingers, or other body parts during sexual penetration or stimulation. Internal condoms also called female condoms are inserted into the vagina or anus prior to sexual penetration. These condoms are made of either polyurethane or nitrile.