the period and or process of achieving a pregnancy

A viciously sexual predatory beast. Always has the urge to have unprotected sex, and carries it out between 13 - 666 times a day, each with a different woman. A virgin girl would lose her innocence in mere seconds, just through plain eye contact with one, and girls as young as 2 are rumoured to have had to take contraceptives after being in the same room as one. On the off-chance you happen to involve in sexual activities with one and they do use a condom, that will still not be enough to protect you from the might of a horny impregnator.

Sometimes (rarely) people with testicles are also referred to as impregnators for their ability to impregnate, however it is inappropriate to use it in this manner and generally only older people will use it like this.

To make a woman or female animal pregnant.

This is a slightly convoluted way to become impregnated if the female hates vaginal penetration. The female fellates the male and performs the well known 'snowball', spitting the semen into the male's mouth. Quickly, so as not to damage the sperm by over exposure to oral acids, the male then spits the semen into the female's vagina, thrusting it inside with his tongue.
If this technique is part of a prolonged sex act, then creampie or cunnilingus maybe part of the immediate following proceedings.

A man who impregnates any woman he dates, preferably just before he dumps her.

the act of having a wet dream while sleeping in the nude, and your skeet stains your mattress

The act of jacking off in the shower.