do males reach sexual maturity based on their age or their size? or does it vary from one animal to the next? i just saw an ad for a 530 gram male that is supposedly producing sperm plugs. sounds a little too small to me, but i do have a friend who successfully mated a male spider last year at somewhere in the neighborhood of 650 grams. which brings me to my question. is it more a matter of size or age?

