On the contrary, The Apostle (2 Cor. 6:5, 6) reckons "chastity" together with "fastings" which pertain to abstinence.
I answer that, As stated above (Q. 141, A. 4), temperance is properly about the concupiscences of the pleasures of touch: so that where there are different kinds of pleasure, there are different virtues comprised under temperance. Now pleasures are proportionate to the actions whose perfections they are, as stated in Ethic. ix, 4, 5: and it is evident that actions connected with the use of food whereby the nature of the individual is maintained differ generically from actions connected with the use of matters venereal, whereby the nature of the species is preserved. Therefore chastity, which is about venereal pleasures, is a distinct virtue from abstinence, which is about pleasures of the palate.
Reply Obj. 1: Temperance is chiefly about pleasures of touch, not as regards the sense's judgment concerning the objects of touch, which judgment is of uniform character concerning all such objects, but as regards the use itself of those objects, as stated in Ethic. iii, 10. Now the uses of meats, drinks, and venereal matters differ in character. Wherefore there must needs be different virtues, though they regard the one sense.
Reply Obj. 2: Venereal pleasures are more impetuous, and are more oppressive on the reason than the pleasures of the palate: and therefore they are in greater need of chastisement and restraint, since if one consent to them this increases the force of concupiscence and weakens the strength of the mind. Hence Augustine says (Soliloq. i, 10): "I consider that nothing so casts down the manly mind from its heights as the fondling of women, and those bodily contacts which belong to the married state."
Reply Obj. 3: The pleasures of the other senses do not pertain to the maintenance of man's nature, except in so far as they are directed to pleasures of touch. Wherefore in the matter of such pleasures there is no other virtue comprised under temperance. But the pleasures of the palate, though directed somewhat to venereal pleasures, are essentially directed to the preservation of man's life: wherefore by their very nature they have a special virtue, although this virtue which is called abstinence directs its act to chastity as its end. _______________________
FOURTH ARTICLE [II-II, Q. 151, Art. 4]
Whether Purity Belongs Especially to Chastity?
Objection 1: It would seem that purity does not belong especially to chastity. For Augustine says (De Civ. Dei i, 18) that "purity is a virtue of the soul." Therefore it is not something belonging to chastity, but is of itself a virtue distinct from chastity.
Obj. 2: Further, pudicitia (purity) is derived from pudor, which is equivalent to shame. Now shame, according to Damascene [*De Fide Orth. ii, 15], is about a disgraceful act, and this is common to all sinful acts. Therefore purity belongs no more to chastity than to the other virtues.
Obj. 3: Further, the Philosopher says (Ethic. iii, 12) that "every kind of intemperance is most deserving of reproach." Now it would seem to belong to purity to avoid all that is deserving of reproach. Therefore purity belongs to all the parts of temperance, and not especially to chastity.