For questions related to biological sex, sexual preferences and related topics, including LGBT (lesbian, gay, bisexual and transgender) themes.
The reproductive drive is one of the most potent forces of human psyche, and as such, the topic of sexuality is certainly a fairly important one in works of art/writing.
This topic, if broached tastefully and intelligently, is on-topic for SFF StackExchange, but you need to be careful that your post is
Not gross or offensive
Is asked in good faith, instead of merely for shock value.