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:

A1 What is the matter of lust?

A2 Whether all copulation is unlawful?

A3 Whether lust is a mortal sin?

A4 Whether lust is a capital vice?

A5 Concerning its daughters.