Using 0.4.2 here. I noticed that if the horse gets penetrated while in a bent- over position, the area just above the anus clips into the buttocks. This causes a bit of an ugly-looking 'tear' on either side. https://i.gyazo.com/617fd1fc9fa6c3d2c2eceeb1d2528f2c.gif
It's a fairly minor cosmetic issue, but it's definitely noticeable and slightly annoying.