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.
Please note - use "Preview" to check what you have written and how it will appear before you "Respond", and because this forum is moderated, you will not then see your submission until the moderator has a chance to confirm it.