Peeping Tom

Perhaps it relates to someone who has not really grown up sexually and so has not met a woman’s or man’s full sexuality with their or full sexuality. So it may indicate infantile feelings, maybe because they have never actually seen the opposite sex naked and full on. See Beware of Love

“Reproductive sex does not necessarily require a heterosexual orientation, since orientation refers to a long-term enduring pattern of sexual and emotional attraction leading often to long-term social bonding, while reproductive sex requires only the basic act of intercourse, often done one time only. ” (Quoted from Wikipedia). So the term making love is a fallacy, it should be, “having sex”. See burglar intruder