Single moms and married moms looking to “upgrade” their husbands may take their daughters out to socialize. The mother often uses her daughter’s presence to attract men while steering away those who show interest in the daughter instead of her.
Man: “Hey! You two look like sisters!”
This type of compliment makes the mother tingle inside.
Much like how a fat ugly friend might chase away men interested in her hot friend, the mother may do the same for her daughter. And in situations like these, a second man is often needed to “take one for the team” by charming the mom or the chubby friend.