It looks like it’s time for me to go on a blocking rampage on Twitter, because the TERFs/GCs are flooding my account with stupidity. There’s only so much of that that I can take. The problem is that Graham Linehan noticed me, and the flock of dim & bigoted fanatics who follow him are piling on. One of them noticed that I breed spiders and thinks that is an excellent gotcha.

One thing I find gratifying is that sex-denialists like @pzmyers wibble on about sex being socially constructed and bimodal. But when they actually want something done (in this case breed spiders) – they suddenly know there are exactly 2 sexes and it’s the females that make eggs!
I make movies of spiders mating, as he notices, but somehow he thinks I’m a “sex-denialist” and that somehow this contradicts my position on trans rights. Surprise! I actually know how sex works. I understand that making an embryo requires a fusion of two gametes. I would think all of the trans folk he despises would be more conscious of these distinction than he is.
I also know the logical difference between the fact that many females make eggs, and the idea that all females must make eggs. I also know that even in spiders there’s more to sex than tab A goes into slot B.
I also have information on that. I’m mainly interested in spider sex as a means to an end — I need lots of embryos — but to get there I’ve been making observations of spider behavior. Every morning I move a male spider into a container with a female spider, slide it under a dissecting scope, and watch what happens. Sometimes courtship and mating are swift and dramatic, and I click a button and record the whole process, and that’s what you see. Sometimes they take their time, and I have to watch them dawdle and fumble around for a half hour before anything happens. Sometimes I give up and put the pair in an incubator overnight and hope something happens. Rarely, the female just murders and cannibalizes the male. Of the clutch of spiders that emerged in January, I’ve got 11 females who successfully mated and produced an egg sac; I’ve got 16 that spurned the male I provided and are effectively childless. Those I don’t record, because two wallflower spiders avoiding each other isn’t particularly interesting.
What’s going on? I don’t know. My focus isn’t on the behavior, but on the development of embryos. But who knows — maybe there are gay and lesbian spiders. Maybe some are asexual. Maybe there are timid spiders and bold spiders. Maybe some spiders are unattractive and no one wants to have sex with them. Maybe the Adult Spider Female is focused on her bug-munching career, and doesn’t want to make babies. Maybe some pairs of spiders have cellular incompatibilities that prevent fertilization. Maybe for some spiders the behavior works, but the plumbing is atypical. These are all interesting possibilities, and if a student were to come along and ask to make a quantitative analysis of mating behavior and reproductive success, I think there are a lot of good questions to ask and some useful studies to make, because sex, even in a small arthropod as driven by instinct as a spider, isn’t binary, isn’t a question of did they or didn’t they, and exhibits a range of complex variation that I haven’t tried to plumb.
Other people are looking into that! A paper by Angelekakis, Turutzek, and Tuni (2022) looked into mating rates in Parasteatoda, and as I’d expect, it’s complex. Spiders can be choosy — the majority of females didn’t mate at all (as I’m seeing in Steatoda), and many would mate only once and then be done with the whole messy business (they store sperm, so one successful mating is sufficient for a lifetime of egg production.)
As usual, the TERFs/GCs try to ignore all that and shoehorn everything into a simple binary. It doesn’t work for spiders, and it especially doesn’t work for humans, who have layered on so many variations and subtleties and tangled them all up with non-reproductive cultural behaviors. This @nathankw nitwit tried to argue that sex can’t be bimodal because I can’t provide a single numerical parameter that shows a range of values for sex. The problem isn’t that I can’t, it’s that I can provide so many. Receptivity, courtship initiation, web twanging frequency, successful insemination frequency, dancing intensity, abdomen size, interval since last courtship, metabolism levels…I can think of so many measures that don’t exhibit the kind of fixed values that he wants for males and females. It’s overlapping ranges all over the place! In spiders! But he wants to pretend that human sex is simple, nothing but sperm and ova.
Graham Linehan really didn’t have anything to contribute, other than to claim my biology is a religion, and to add this silly little bon mot:
But if humans can’t change sex, why is this crowd so opposed to gender affirming care, hormonal treatments, and surgery? If sex is an unstoppable freight train that can’t be diverted, then let them continue with their ineffectual efforts to change sex. Except that they keep seeing the inescapable evidence that sex can and does change.
Angelakakis A, Turetzek N, Tuni C (2022) Female mating rates and their fitness consequences in the common house spider Parasteatoda tepidariorum. Ecology and Evolution, doi.org/10.1002/ece3.9678.













