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That is where training and will power take over, and you are supposed to stop and hold back. Warning, a heating pad if to hot can, sorta melt or deform your insert. Of course I washed the whole thing fleshlite before use too.
If you want to have a nice long self love session this is a great insert to use. I ran out and tried spitting in it today and it actually hurt my dick.
The manufacturers claim that the Speed Bump Fleshlight is not as fleshlite intense as the Super Ribbed, but I beg to differ. I was pretty curious as to how it fleshlite is gonna feel when I push my dick into it, and it really feels very real.
One really nice fleshlite thing about this insert is that it is very easy to hold back your orgasms. First one is the need to warm up the thing, without warming it up its not that good. My penis was about 2 to 3 inches within the insert when I decided to withdraw a bit and explore the sensations of the waves.