Sins Against Nature

Unnatural Lust.—Worst among the sins of impurity, as such, are crimes of unnatural lust, for they exercise the sexual act, not only illicitly, but also in a manner that defeats its purpose of reproduction. In some non-venereal respects, however, natural sins of impurity may be worse than the unnatural; for example, adultery is worse as regards injustice, sacrilegious lust as regards irreligion, etc. There are four distinct species of unnatural impurities— pollution, unnatural coition, sodomy, bestiality (see Denzinger, n. 1124).

(a) For procreation nature requires copulation, and hence pollution is unnatural, for it exercises semination without copulation, either alone (self-abuse, solitary vice, masturbation) or with another (softness).

(b) For procreation nature requires proper copulation, that is, one that will permit of a fertile union between the two life elements, the sperma and the ovum. Hence, unnatural coition does not comply with this necessity, for it does not employ the proper organ of sexual union, substituting rectal for vaginal intercourse, or else by some form of natural or artificial onanism it frustrates the act of its destined conclusion. This sin is worse than pollution, since pollution omits to use intercourse, whereas unnatural coition positively abuses it.

(c) For procreation nature requires heterosexual intercourse, a condition disregarded by sodomy, which is the lustful commerce of male with male (pederasty, uranism), or of female with female (tribadism, sapphism, Lesbian love). This sin is worse than unnatural coition, for it is a greater perversity to neglect one of the two needed life elements than to neglect the right process for their union (see Gen., xix. 24, 25; Lev., xx. 13; Rom., i. 26, 27).

(d) Finally, for procreation nature requires homogeneous intercourse, a law violated by bestiality, which is coition of a human being, male or female, with a brute animal. This is the worst of unnatural impurities, since it sins against the most fundamental condition for the sexual act, namely, that the participants be of the same nature (see Lev., xx. 15, 16). Similar to bestiality is the crime of necrophilism (intercourse with a corpse).