Deepthroating is a blow job where his entire dick goes down her mouth, so far so that it reaches their throat. Sounds easier than it is. So proceed with caution. For beginners it is best for her to be in control (on top). Put your hand around the base of his dick, so it doesn't go to deep. Your next step can be to allow him to control. For any rougher sexual acts it is (even more) important to always respect each other's boundaries. Agree on a clear “safeword” so the other knows to stop right away. No exceptions!
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