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please start by reading even further back; the contents of two or three "index" pages. It really is all there in the end.
Asking questions is fine, as long as you have done the reading.
I repeatedly warn that loving sex is no more vigorous nor uncontrolled than masturbation. Contrary to what you will see in porn, women generally do not contribute a great deal of the thrusting (due to the mechanics of the situation; they require more complex and generalised body movements to do so, which are rapidly fatiguing) and are ill-advised to become too vigorous for significant risk of damaging the penis by bending.
There certainly is some risk of tearing the frænulum; it has been described here on various occasions, and it will bleed if this happens. This is not however life-threatening (any more than a torn hymen for a young lady, and about as uncommon nowadays) but if anything, that actually provides an opportunity to stretch as it heals, and effect significant loosening in one step - no less desirable than formal surgery.
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