1. 射精终止：射 精 Ejaculation | 射精终止 Onanism | 阴户外射 Coitus interrupted
noun
1. a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
Synonym: coitus interruptus withdrawal method withdrawal pulling out
2. manual stimulation of the genital organs (of yourself or another) for sexual pleasure
Synonym: masturbation