We must next consider the vice of lust which is opposed to chastity: (1) Lust in general; (2) its species. Under the first head there are five points of inquiry:

A[1] What is the matter of lust?

A[2] Whether all copulation is unlawful?

A[3] Whether lust is a mortal sin?

A[4] Whether lust is a capital vice?

A[5] Concerning its daughters.