I’m going to push back against everyone saying that the algorithm knows. While not unthinkable, I believe it is much more likely that it is a coincidence, and what you’re experiencing is called the frequency illusion. Simply because your sexuality has been on your mind lately, you’re more likely to notice things that remind you of it - not because those things are more prevalent but simply because you, subconsciously, pay more attention to them.
That said, privacy is important and you should definitely try to maintain it - e.g. use a private browser window in a fresh browser instance to research things related to sexuality.