when in a group my male will have a go at the females and push them around a bit
but not overly agressive
the tank is 2.4 x .6m
sustained mouth to mouth pushing would suggest 2 males
IME male to female contact doesn't last too long
that said .the dynamics in a group of fish can change depnding on the size of the area they are housed in and hidey holes etc
also the personality of the individual fish comes into play, some are bullies some not