Having oral sex with a mouth on the penis can transmit these STIs:

• Chlamydia
• Gonorrhea
• Herpes
• HPV (warts)
• Mpox
• Syphilis

The person using their penis can also get this STI:

• NGU (non-gonococcal urethritis)

The person using their mouth can also get these infections:

• Hepatitis A
• Shigella

This STI can also be transmitted through oral sex, but only very rarely:

• Mycoplasma genitalium (M. gen)

You cannot get HIV from oral sex. HIV does not transmit through saliva (spit), and the mouth is naturally resistant against HIV. If sexual fluids get in your mouth, the chances of you getting HIV are so small that we consider them to be zero. In fact, when someone's only possible contact with HIV was oral sex, we do not even recommend an HIV test.

Having oral sex with a mouth on the vulva or front-hole can transmit these STIs:

• Gonorrhea
• Herpes
• HPV (warts)
• Mpox
• Syphilis

This STI can also be transmitted through oral sex, but only very rarely:

• Mycoplasma genitalium (M. gen)

You cannot get HIV from oral sex. HIV does not transmit through saliva (spit), and the mouth is naturally resistant against HIV. If sexual fluids get in your mouth, the chances of you getting HIV are so small that we consider them to be zero. In fact, when someone's only possible contact with HIV was oral sex, we do not even recommend an HIV test.

Having oral sex with a mouth on the anus can transmit these STIs:

• Herpes
• HPV (warts)
• Mpox
• Syphilis

This STI can also be transmitted, but less commonly:

• Gonorrhea

The person using their mouth can also get these infections that are found in the digestive tract:

• Amebiasis
• Campylobacter
• Cryptosporidium
• Giardia
• Hepatitis A
• Salmonella
• Shigella

You cannot get HIV from oral sex. HIV does not transmit through saliva (spit), and the mouth is naturally resistant against HIV. If sexual fluids get in your mouth, the chances of you getting HIV are so small that we consider them to be zero. In fact, when someone's only possible contact with HIV was oral sex, we do not even recommend an HIV test.

Having anal sex can transmit these STIs, whether you are the one using your penis or using your anus:

• Chlamydia
• Gonorrhea
• Hepatitis B
• Hepatitis C
• Herpes
• HIV
• HPV (warts)
• Mpox
• Mycoplasma genitalium (M. gen)
• Syphilis

The person using their penis can also get this STI:

• NGU (non-gonococcal urethritis)

Having vaginal/front-hole sex can transmit these STIs:

• Chlamydia
• Gonorrhea
• Hepatitis B
• Herpes
• HIV
• HPV (warts)
• Mpox
• Mycoplasma genitalium (M. gen)
• Syphilis
• Trichomoniasis

The person using their penis can also get this STI:

• NGU (non-gonococcal urethritis)

Genitals touching with no penetration can transmit these STIs:

• Herpes
• HPV
• Mpox
• Syphilis

These STIs could also possibly transmit, but only if one partner's body fluids touch the mucous membranes (the moist parts) of the other partner's genitals:

• Chlamydia
• Gonorrhea
• HIV

It is uncommon for STIs to transmit through handjobs and fingering. This is because STIs most easily transmit when a person's genitals touch another's, or when a person's genitals touch another person's mouth.

Though it is uncommon, here are the STIs that can be passed through handjobs and fingering:

• Herpes
• HPV
• Mpox
• Syphilis

Here are the ways that these STIs could transmit in this situation:

• The partner using their hand to touch your genitals has just touched their own genitals, or the genitals of someone else, and those genitals had one of these STIs. This can transmit the STI to your genitals.
• You have one of these STIs in your genitals, and the partner using their hand to touch your genitals touches their own, or someone else's right after. This can transmit the STI to that person's genitals.
• The partner using their hand has broken skin on their finger, and the partner they are touching has herpes. This can cause a herpes infection of the finger called herpetic whitlow.

Washing toys between partners, or putting a fresh condom on the toys, can prevent transmitting STIs and other infections.

Deep kissing with tongue can transmit these STIs:

• Herpes
• Mpox

These STIs can also transmit, but it is less common:

• Gonorrhea
• HPV
• Syphilis

Cutting and other blood play can transmit these STIs, because they are carried in blood. They can transmit when the blood touches a partner's cuts or other openings in the skin.

• HIV
• Hepatitis B
• Hepatitis C
• Mpox

Using sterilized or fresh equipment lowers the chance of transmitting these STIs.

Hollow-bore needles and syringes are more difficult to sterilize than equipment that is not hollow. This is because blood can stay trapped inside the hollow bore of the needle, or inside the syringe.

You cannot get an STI by touching yourself.