Quick Answer: A handjob is a manual sex act involving a person stimulating the penis or scrotum of another by using the hand. This is done to induce an erection for sexual pleasure, sexual arousal and may result in orgasm and ejaculation. A handjob can be performed as either foreplay or as non-penetrative sex. It is analogous to fingering. Someone may give a handjob so as not to engage in penetrative sexual activity. Besides avoiding the risks associated with sexual penetration, such as sexually transmitted infections or pregnancy from unprotected penile-vaginal sex, some people engage in non-penetrative sex to preserve virginity.