Knotted dildos borrow the bulb that sits at the base of some animal anatomies. The shaft goes in first. The knot asks for a pause, more lube, and a slow push until it seats, after which the slimmer neck can rest in the sphincter or vaginal opening.

Diameter at the knot is the number that matters. A modest shaft with a sudden 50 mm knot is a different toy from a thick shaft with a mild swelling. Soft outer silicone helps the knot pop through without feeling like a doorstop. A firm core keeps it from collapsing.

Take it out as slowly as it went in. The pop on exit can be intense. A suction base lets you control depth with your hips rather than with an overeager hand. For anal use the flare below the knot still has to be wider than the knot. That looks bulky and that is correct.

Technique

• Warm up with the shaft only.
• Push on an exhale.
• If the knot will not pass after a fair try, stop for another day.
• Clean behind the knot where lube collects.