Blow job is the colloquial term for fellatio during which the penis is stimulated with the mouth, tongue, lips, and also with the teeth. The term fellatio stems from the Latin verb fellere which means to suck. Other expressions are French sex or giving head. It is often part of the foreplay to cause an erection or to enhance the sexual lust. Especially juveniles like blow jobs during petting in order to gain first sexual experiences. Moreover, it enables men who have a weak erection and who cannot perform vaginal or anal intercourse to experience penetrating sex. A blow job can be given in different positions and it can also be combined with other sexual practices.