Sooo are centipedes like fruit flies and not engage in any real form of sexual selection, or is the female going around judging the fuck out of every jizz pile she encounters?
"Mmm-mm, look at that poor viscosity, obviously from a low-quality male. This one on the other hand: deep color, firm texture, nice and sticky... clearly produced by a male with the superior genes I want to pass along to my offspring."
Sexing centipedes is no easy task, most species cant be sexed at all visually. Try to avoid sexing them if you have no intention of breeding, as risks far outweigh rewards and you could easily kill your centipede as well as causing a lot of unneeded stress.
To sex your centipedes (make sure you’re comfortable, as this is a very risky procedure). Put the centipede in a glass or plastic jar with a small hole in the lid, start filling the jar with water until its full. Keep an eye on it, once your centipede becomes unconscious remove it from the water and place on some paper towel. The sex organs are found in the last segment, apply slight pressure to the second last segment and they should pop out. Take some high quality pics and compare them to pics available online. You can also knock them out with CO2 gas.
I'm running out of time to find real husbandry, but I imagine it's a rather hands-off affair