Sexuality is a complex myriad of identities. So the question stands: They may be bisexual or pansexual, for example to name two of the more commonly used terms. Read Testimonials. I'm not. I am very much interested to know you and hopefully become your friend.
As a gay man happily partnered for 10 years now trust me
See who their friends are. No data is shared with Facebook unless you engage with this feature. What about painting, fitness, biking, aviation, cooking, horticulture, and so forth?
So don't waste your time trying to analyze what it means if your female friend changes the way she dresses, or if your male friend is suddenly wearing tighter pants.