It is having a sorta tingling sensation in your &gt;!groin!&lt;, almost as if you are &gt;!aroused!&lt; (but you're actually not, and you can tell because &gt;!arousal!&lt; involves other sensations too). I get this (often randomly) and when combined with my intrusive thoughts of &gt;!sexual deviancy!&lt;, it's f\*cked.