Snapping hip syndrome?

When me and my boyfriend have sex and he swings my leg over him or just out of the way sometimes I get this really sharp pain that is only solved by straightening out my leg and I thought maybe it was because I wasnt flexible and I've never worried about it but today I've been walking to and from class and I feel the same kind of pain on the same side of my hip/thigh. I haven't worked out in a while so I know it's not a strain. If I put my hand there I feel the pop when I walk. I looked it up and it says it's snapping hip syndrome.