We live in a time when people are free to express themselves however they want.
This might not always be a good thing (scroll social media for some examples ;) ), but it does bring a freedom to your writing.
More specifically, it brings a freedom to how graphic you want your writing to be.
Sex scenes are no longer taboo in literature. While many people might not want to admit that they've read a book like Fifty Shades of Grey or won't be seen reading it on the bus on their way to work, that doesn't change the fact that such books exist and present no shame to the authors.
You can write whatever you are envisioning.
So go ahead, write scenes that make you blush. They can get printed. And, if book sales tell us anything, they will be read.