Hope you like fish porn! Here are some guppy mating pictures that I’ve photoshopped into a pleasing array. Yes, this is what I do with my time. I’m rather pleased with these photos as it’s surprising difficult to get these guys in focus when they are frantically swimming around. A brief overview: the colourful male guppy is trying to mate with the larger, grey female.
Some highlights include the second photo on the left, which depicts a male mid-sigmoid: a guppy courtship display. In the third from the left, this male is employing a more sneaky mating strategy, appropriately called a ‘sneak’. You can see his gonopodium (re: his dick) mid swing, as he swims toward the female in hopes of inseminating her. I didn’t say this would be pretty. Male guppies usually switch between these two mating strategies, being more gentlemany if the female seems interested, and switching to being a sneak when she’s not (which happens to be most of the time– sorry boys).