I guess the skill description seems to be just a joke.
Viewing post in Agent17 (18+ Adult Game) comments
Some sexual scenes and interactions can only be done with higher stealth. If your stealth is low and you want to see scenes that require stealth you have to level it up. There are a few awesome scenes and sexual interactions you probably missed and are going to miss in later patches due to low stealth. Keep licking Dana's breast during the night when she is asleep to max it.