I only recently started adding people and for the most part I only add females, since I'm a female, and I'm not here to hook up. I only add only people after I've read their stories, comment on their stories and I feel a connection to them.
I only accept requests from people who have done the same.
I'm not sure why some people want me in their circle. When I receive a request, I click on their profile and see what experiences they have shared, if they are male or female, what groups they are a part of then if I see we have lots that are similar and they aren't part of weird fetish groups and sex groups I accept their request.