The release of semen into the vagina is called

The process of release of seminal fluid into the vagina of a female is called insemination. When this process is carried out artificially, it is called artificial insemination. 

Ejaculation is the process of release of seminal fluid from a male's penis.

Impotence, or erectile dysfunction, is characterised by difficulty obtaining and maintaining an erection.

Implantation is the process by which a developing embryo moves through the uterus as a blastocyst, makes contact with the uterine wall, and remains attached until birth.