@DFP you’re welcome!
I can also appreciate the implication (although not actually said as I have no wish to put words in your mouth) that penile insertion might be more about the insertee’s pleasure at being so helpless.
No implication really. It might be more popular amongst people who fantasise being the insertee, but it’s not exclusively for them then either (see: posts above on sounding, and also consider non-participants as either witness/voyeur characters or a reader/consumer of media).