Plus, many of these NPC's you rescue or perform a good deed for you continue to interact with. Sure some of them never speak with or see you again. Others, such as Moira, Red, Bittercup and Sydney, you can continue to interact and get to know. What's wrong with a little companionship and comfort being offered by some of these women? Not only would they get the physical interaction, they'd also presumably get to share your wealth and benefit from your protection as well.
Sort of like Dukov's girls. And as is apparent from their interactions with you, and the dialogue choices you have with them, in the Fallout universe as well as our own you're still a [censored] even if you give your "services" in exchange for protection. You might have to do it to survive, but it's still demeaning.