Sex will always sell. Many of us girls prefer reading/writing guy on guy boom chicka boom boom.
As a straight, female ,older (ish), wanna-be-good writer, it's both difficult and easy to write sex scenes.
It's easy because, well, it's sex.
It's difficult because, well it's the opposite sex.
Most of the time it's an important part of the story, helping to establish, build, or tear down a relationship.
In the end, all that matters to me is the hope that my readers enjoy whatever it is my brain conjures up. To each his own and I'm grateful when they like it, and if they don't, that's okay too.
Great article!