There are some other options to get a women only race without recurring to (simultaneous) hermaphroditism or real monogender. You may simply have either non-humanoid males (think for instance in the parasitic males in abyssal anglerfishes), sequential hermaphroditism (all the individuals are born male and they switch to female at some point).
Furthermore, even as real asexual beings,you could made some tasty sexy scenes if, for instance, you make them able to "feed" on body heat. If so, your species should be cold, but only because they are very efficient at keeping body heat, and they attack you because you are warm. Naturally, all this could fit very well into the hypothermia mechanics that are planned for Uveto's artic weather. Also, warm bodies may be important for their reproduction. For instance, adult female-like yuki-onnas just produce some "spores" that grow between their feathers. The spores rapidly turn into some kind of cute furball, that is in fact yuki onna's larva. The larvae must find a warm spot in order to complete its development and become an adult yuki onna. And one of such warm spots may well be our captain's holes, thus triggering a pregnancy-like event (perhaps inducing syntoms like enhanced sensibility to cold, as you try to keep you body warm for the larvae; or increasing hunger due to higher metabolism). Encounters may consist in lonely yuki onna larvae (similar to young cockvine, for instance); swarms (weak encounter, but it can make a great scene of the main character being raped by a swarm of cute tiny furballs), and adult yuki onna (that may carry some larvae and use your warm inners as incubator chambers).