[1.3.3159] Tamed insects won't mate

[Ripmorld]

I tried to zone them into a one tile room , and they aren't having the orgy that any other animals had. At first I thought it was intentional , but then I could still use the add hediff to cause the female to become pregnant , even the miscarry from starvation works. Why would you implant those features if it wasn't intentional ?

So is it a bug that bugs don't mate?

[Ark]

No.

See Megaspider does not become pregnant.
Maybe try Improved Insectoids.

[Pheanox]

Thanks for the bug report.  This is intended, they can't be pregnant. However I have reported this discrepancy and the display of their pregnancy stats should be removed in upcoming versions of the base game.