I was a very promiscuous boy and have kept that tradition alive into adulthood.
Can I ask what age you are refering to as a boy?
You will read on this site how many survivors post of recalled memories and flashbacks.
There are some disassociation events in my past and can only remember parts
So in answer to your ? Yes itís possible to not remember being abused.
I too was promiscuous as a boy and each time was an abuse event - why? An 8-11 year old's body may react but their mind is not programmed to indulge in full on sexual activities, MB, oral or anal as was my experience.
Also was there an age difference, or power imbalance with your sex partners. There was in my case from 5-30 years age difference, and an older brother had the power so i would hide in a closit if he found me alone in the house.