She's answering some other woman about this instead of talking about her own sex life, but she's still wrong.
The letter writer's significant other is not feeling her anymore, or he's got some heavy shyt going on in his life that he doesn't feel comfortable telling her because he's not sure if she would support him or laugh at him. It's one of the two.
Dudes have been figuring out ways to avoid having sex with women they're not into since long before Fortnite. Ug would be like, "Not tonight honey, I'm making cave paintings with my boys."
So either he just is not attracted to her at this point or some shyt went down that he's not telling her, but that is weighing on his mind.
men are also going out less more. a lot of casual sex comes from bars, the club, drinking. people/men have figured out ways to entertain themselves without going to a bar or club and dropping a bill or two buying drinks
also many women have figured out ways to navigate getting things from men without feeling it necessary to entertain them on a sexual level, which has cut down on sex more. let’s not ignore the whole glorified curving trend.