I recently brought home a pair of 18 week old (approx) boys. Sold as a pair from same litter. How old are boys when you can clearly see their scrotum? Mine don't have obvious bulges there, and I managed to snap a pic of Flash on the bars. I did notice that Michael's genitals were not at all visible through his fur, but he was too fast for me to take a pic. So heres Flash. Am I seeing nipples? I'm worried I've been sold two females, or more worryingly, one of each.