I got 2 kittens in the beginning of may the queen first than the male cat a few weeks later. They have not been fixed yet because the vet said to wait untill around 6 months (which will be september). Today the male cat kept trying to hump the queen. She does not show sings of being in heat. Is it maybe he has become sexually active or maybe she is going to be in heat soon and he san sense it? Neither of them have sprayed ever. He smells her there and than tries to hump her. Should i be alarmed? any advise you guys can tell me?