If you have your vagina plugged by Gel Zon (which is supposed to disable various vaginal scenes on Uveto), multiple scenes remain possible with the frostwyrms (including riding Nykke's dick vaginally, or being bred by Frosty but having it default to anal sex, complete with an error message of "no pregnancies detected!" when it tries to let you stay for four months to gestate and incubate).