You can measure how much collagen a child has by bending their fingers backwards comfortably. Not all children have equal amount of collagen. Collagen supply is a limited resources determined at birth. If your mom was a smoker and or a drinker/drug user etc, your pussy won't be as tight girl. Sorry to let you know.
It should be noted that feminine potency can be regenerated, or improved through exercise, yoga and eating health. Just like masculine potency.
I feel like people just give opinions without even properly reading the question. Big insertions refers to things like dildos the size of an arm for example. Not your micro dick.