Don Lothario is a Sim featured in The Sims 2 LP (Season 2) as the husband of Amanda Lopez and the father of Rose, Piper and Willow Lothario. He is mentioned in The Sims 3 Ambitions LP as the father of Bliss Goth.
Don Lothario resides in Pleasantview. He was the local womanizer, holding down relationships with four women at once. At the beginning of the LP Don was in love with both of the Caliente sisters, Nina and Dina, and engaged to Cassandra Goth, as well as having an affair with Kaylynn Langerak.
Don moved into an apartment unit opposite Amanda and Avri. Don and Amanda quickly hit it off and she begins an affair with him, eventually to be caught by her boyfriend. They begin a relationship once Amanda and Avri have broken up. From the point of dating Amanda, Don seems to have forgotten about the other women and has no desire to cheat on his new girlfriend; this can be contradicted due to the fact that, at some point in life, Don must've had an affair with Cassandra which resulted in the birth of Bliss (unless the Ambitions LP exists on an alternate timeline, which Lifesimmer has yet to confirm).
In Part 5: Prego, Amanda got pregnant with Don's baby, and in Part 7: Baby, their daughter Rose Lothario was born. Don moved in to take care of his child. Meanwhile, and unbeknownst to Amanda, he was still engaged to Cassandra Goth. In Part 12: Proposal, Don breaks up with Cassandra over a meal out, and instead proposes to Amanda. They get married at Gothier Green Lawns in Part 13: Honeymoon. Over Part 13: Honeymoon and Part 14: Vacation Special, the newlyweds enjoy their honeymoon in Twiikki Island. Don rolls the Want to have another baby.
In Part 17: Twins, Don and Amanda had twin girls, Willow and Piper. He proves himself to be an unexpectedly good father: tucking the kids into bed, teaching them their toddler skills and establishing good friendships with his daughters. Sometime between Part 26: Blabber and Part 27: Alec, the Lothario Family moved into a new house, courtesy of Rose's new husband, Mortimer Goth.
Don is now an Elder, still working as a doctor and providing for the family. He is the expectant grandfather of Rose's unborn child.