While there are no euphemisms for sexual acts and organs, there are dysphemisms–terms that are "strong language", inappropriate for certain company, and so on. The sexual lexicon in use nowadays ranges from the generic to the wlko equivalent of locker-room language.

Sec.8.2 The commonest term for "ejaculate", used by both sexes, involves a common Wlko verb, nz-ktehhss, meaning "to contract with a sudden spasm; to squeeze abruptly and forcefully", and used of the testicles (though rarely with the generic term for testicles). There seems to be no straightforward way of rendering the Wlko expression in our language. Jerome’s "have a cramp in one’s scrotum" fastens on the wrong sense of nz-ktehhss. Ornstein and Kitell’s suggestion, "my/his (etc.) nuts (or balls) snapped", conveys the feel of the Wlko phrase for while remaining far from literal. ("I/he snapped", with or without mention of an organ, has the same sense, though the transitive use is decidedly and may be a mistake of observation: wlkon seem to feel that ejaculation is a spontaneous physiological event more or less beyond their control, like sneezing.)

But these are all relatively rare, because the normative social attitude of co-mates toward sex, both with one another and females, can only be described as both tender and frank. In fact, by my own observation, it is often difficult to tell whether a male and female wlko are merely hugging and caressing one another or actually copulating, so gentle, often, is the progression from affectionate embrace to intromission to climax. With adult males, anything that looks like intimacy is almost certainly sodomy, and as it progresses to the more vigorous phases, manifestly so. Adolescent (open) males do a lot of roughhousing, on the one hand, and lying quietly together on the other; but they are sexually very active, not uncommonly sodomizing one another three or four times a day. It tends to be vigorous, even athletic, and expressions of the type "make like a short-whiskers" (or, much more vulgarly, "link like a boy") is proverbial for any activity in which enthusiasm and physical vigor is more evident than skill or finesse.

The cruder sorts of discourse involving sexual acts are almost entirely in the context of male sex, and in fact, the crudest term (almost totally unheard in mixed company), "to link", is also the one most commonly used by males among themselves. Males will also refer to "slotting" a female, a term even the crudest wlko (a rebellious adolescent, say, or–reputedly–a rupellid) would hesitate to use in the hearing of a female.

Wlko speak of an erection with a variety of terms of the "hard" and "stiff" sort, naturally, usually specifically of a "wood(en)" member. But the commonest term for the (erect) male organ among the males is simply "black" (or, more floridly, "black wood"); and, since in its flaccid state the penis is completely sheathed, the expression "show black" or "be black" is easily understood as meaning "(of a male) be sexually aroused". The Wlko expression literally translated as "slip [one’s] black" or just plain "slip" means to lose an erection (mainly after ejaculation or after being sodomized). The reference is apparently to the withdrawal of the organ into its sheath.

Sec.8.5 As already indicated, a sexually mature male who is impotent is known as "cold", and losing the ability to become erect is "going cold". The usual term for sexually able, as was noted already in early field reports, is however not "hot" (though that is occasionally heard; as is also "be a man"). The commonest expression is "(be) red", which the secondary literature once speculated had something to do with the appearance of the erect penis. However, as mentioned above, wlko penises are black. The real key to this odd expression is a very common synonym of "be cold", namely "be white-bellied" or "have white testicles" (an expression used by both sexes, and clearly regarded as more genteel or tactful than "be cold"). Males, especially, will of course substitute racier synonyms, like "white nuts" (or "balls") or "white-belly", or go in for florid elaborations, such as might be translated as being "white-furred in the fucking department").

The explanation for the "red" and "white" terminology is the effect of the precopulatory sexual fluids of a sexually aroused male, known in Wlko as hkshihh, which fluids as described above flow from the penis sheath even before the erect organ itself appears, and continue to flow as long as the beast is erect. It will soak the fur of the sheath and scrotum and surrounding areas, even to the point of dripping from the scrotum and running down the insides of the thighs. The fluid, or rather mixture of fluids (Sec.4.2.1), is only very slightly yellow in color; but fur which has repeatedly come in contact with hkshihh darkens to a kind of reddish mahogany stain. This stain covers the inguinal area of the male, and is particularly deep in color on his penis sheath and scrotum. The coloration appears to be more than a mere tinting of the fur: microscopic examination indicates that the pigmentation is in the hair strands themselves; and in fact Murdoch and subsequent workers have reported being able to detect only faint chemical traces of sexual secretions even in deeply stained inguinal fur, suggesting that an actual chemical change takes place–the basic structure of some component of hkshihh undergoes some kind of still-unexplained reaction in the course of bonding with the chitinous proteins of the hair. But whatever the chemistry, the bonding is manifestly unstable: within perhaps two weeks of "going cold"–i.e., long before the stained hair strands might possibly grow out–a wlko male’s genital area will be the same creamy white coat as the rest of his chest and belly. Thus, the reproductive status of a wlko male is literally advertised to the world, and the terms in the lexicon refer to these highly visible features.

Sec.8.6 Since quantities of this hkshihh are transferred to the female’s inguinal region during coition, (co-)wives of sexually active males will also be "red". The muzzles of both male and female wlko will be somewhat "red", from grooming activity (including a male’s oral stimulation of a female’s nuptial pads in the course of copulation). In short, a visitor to a wlko family site can easily tell from the appearance of any mature animal whether the co-mates are "cold" or not.