I recommend PositiveSingles.
It’s one of the largest STD dating websites, with over 2.5 million members. The platform offers strong privacy settings to keep your information safe and includes many fun features like Sparks, Winks, blogs, STD Q&A, group chats, topic rooms, and even a pet album.
You can use it on both iOS and Android, and their customer support is available 24/7.
A free version is available with plenty of features, but if you want full access, you can upgrade to a premium membership.