While this book addresses LGBTQ+ issues broadly, it primarily focuses on the experiences of gay and bisexual men, with particular emphasis on dating, sex, and mental health in gay male culture."
This sets accurate expectations and helps the right readers find your book, while not misleading lesbian or trans readers who might expect more content specific to their experiences.
The book is LGBTQ+-affirming and inclusive in spirit, but the lived experiences and specific advice lean heavily toward gay male perspectives. That's not a weakness—it's authentic to your voice and experiences!