Some condoms and lubricants contain spermicide. Spermicides are chemical products that inactivate or kill sperm to prevent pregnancy. Condoms containing the spermicide nonoxynol-9 were previously thought to help prevent the transmission of HIV and other STIs. However, nonoxynol-9 sometimes causes adverse effects, which can facilitate the transmission of HIV. Therefore you should only use condoms and lubricants containing nonoxynol-9 if you …