Father of a Thousand Bastards

A male character with a lot of children out of wedlock, almost always with multiple women. This trope has nothing to do with Mother of a Thousand Young.

Film

 * The concept of Delivery Man takes on this trope as it focus on David Wozniak, who donated his sperm two decades earlier, and now has up to 500 children as a result.

Literature

 * In the Ciaphas Cain book Traitor's Hand, Governor Tarkus' death causes a succession crisis, due to having no heir. However the crisis was made worse due to him preforming "almost two centuries of energetic fornication".

Tabletop Games

 * Forgotten Realms got the King of Cormyr, Azoun IV, who became rather infamous for this. Quoth his Royal Magician's comment on seeing too many young nobles with familliar features at once - "Moderation, my liege?"

Web Comics

 * Julio Scoundrél from Order of the Stick is heavily implied, if not out right stated to be this.