onanism

Masturbation.

Coitus interruptus.

Gratification of the sexual appetite in an unnatural way.

Self-pollution; masturbation.

ejaculating outside the vagina during intercourse; (the performing of) coitus interruptus

masturbation

manual stimulation of the genital organs (of yourself or another) for sexual pleasure

a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation