Our society heaps so much guilt and shame onto sex and sexuality, but a writer who breaks past that to celebrate and empower their own sexuality can empower their readers to do the same.
This excessive concern over a minor matter sounds like the product of an anxious aversion to declaring the book finished.
Your feelings of envy are harming you by making it hard for you to achieve a degree of self-defined success that might lead to you feeling less envious.
Revision requires a shift in perspective, from writer to reader. What do you want your reader to experience while reading your work, and how do you want them to feel at the end?