P, M and O are all pleasurable with some different aspects.
P is mental stimulation.
Dopamine drips and pleasure, desire, attachment and motivation are generated
M is physical stimulation. Dopamine drips and pleasure and sensations are generated. Penis might become sensitized for long periods after event, leading to more repeated interactions.
O is chemical release. Dopamine floods, motivation ceases, refractory begins, other chemicals like prolactin are released and the body enters a different state. Normally oxytocin released is to form relationship bonds, but a black screen and absense of partner creates a dark impression of being unloved and undesirableness. Loneliness creeps in.
Prolong P exposure, M edging and excessive O all cause neurotransmitter burnout when hightened pleasure is sustained for too long and dopamine drips extraordinarily long.
Neurotransmitter burnout leads to lower than baseline neuro transmitter levels, leading to lack of motivation, negativity and depression.
This black hole is PMO created and can be restored if PMO is halted for some time. The body takes time to heal. 90 days abstinence is the suggested timeframe. That time must also be used to restore pleasure relationships with natural environment so happiness is normalized. Else PMO will take over the pleasure vacuum quickly.
Addiction is a matter of desire. Once introduced no one can forget. The option is always open now. That is why it is very important not to engage with any form of vice substances or activity ever.
Don't bother with what others do or believe, take care of your own self first.