Being rock hard in the area that partakes in coitus, in particular within the male specimen (ensure they have XX chromosomes and don't have an extra one either)
bro the density is real rn after looking and albino rhinoceros coitus videos in 4k hdr 60fps specifically on a lg had smart tv with 3 years warranty purchased on the 10th of March 2019 (on sale at harvey norman at half price for a limited time only terms and conditions apply) authorised by Australia government canberra spoken by Jarryd Hayne and Payne Haas