Thank you very much for your reply1st pic female. ( body stance late knob development)
2nd pic male. ( body stance earlier knob development)
3rd pic the one in the back is female the one in the front is male.
Same for pic 4 and 5
6 is female
7 in the pool. The one with his head up looks like male. The other 2 can't tell but the body says female to me.
Those are just my guesses.