Involuntary celibacy is a term applied to people who want to have sex, but are unable to (usually because they are unable to find a willing partner). An involuntarily celibate person is often refered to as being incel.
Incel males are often the target of shaming, due to being over-the-top victim status whores, and trying to shame women into sleeping with them.
Involuntary celibacy or incel is the product of "virgin + entitlement". There you go. Essentially these people feel like the world owes them sexual favours despite nobody owing them anything.
Females can also be incel, if they share the same entitlement to sex while still a virgin, as incel men do.