Hey, did you know that in terms of male human and female alien breeding, Kinecelerans (XLR8’s species) are the most compatible aleins for humans? Not only do they have very humanoid anatomy, sharing things like breasts and birthing hips in common with AFAB humans, Kinecelerans are an average of 5ft tall and 94 pounds. this means they’re obviously large enough to be able to handle human dicks as well as performing positions such as a 69, facesitting and full nelson, and with their impressive resistance feats (XLR8 was mostly unharmed after being thrown trough a building), you can be rough with one. Due to their speed and control of kinetic energy, there’s no doubt in my mind that an aroused Kineceleran would be incredibly fast to get right to the act, so fast that you could easily have sex with one for as much time as you can and while you hold on cumming, she’d have multiple orgasms. They have fur to hide their nipples, so it’d be incredibly easy for one to get you in the mood. No other Alien in the ben 10 universe or not comes close with this level of compatibility.