An oral sex act performed on a male recipient. Typically, fellatio involves licking or sucking the penis; it can also involve the scrotum and testicles. Fellatio may also occur as a part of foreplay to stimulate the male before intercourse.

Some partners use lubricants to enhance fellatio. Flavored lubricants are particularly popular for this purpose, as they can make oral sex more pleasurable for the giving partner. Warming and cooling lubricants can enhance the experience for the recipient.

As with all forms of penetrative sex, both the giving partner and the receiving partner can contract sexually transmitted infections during fellatio. Condoms significantly reduce this risk.