To reduce the risk of transmitting HIV and other STBBIs while giving a blow job (giving head, oral sex, fellatio),
it’s recommended that you avoid taking sperm (cum) in your mouth. Spitting instead of swallowing does nothing to reduce risk; it’s the presence of sperm in the mouth and throat that constitutes a risk.
If you like swallowing cum, make sure you take the right precautions. Avoid brushing your teeth for an hour before fellatio. In addition, any gum problems (redness, bleeding) or sores in your mouth should be treated before giving head and swallowing. For more information, click here.