Not neutered male cat trying to mount spayed female?

Hmm yeah that can definily hurt her, try putting them in different rooms when you aren't there and watching so he dosnt when u are... Until u can save up money to get him fixed because if you do it will help.. Where I live for my male cat the average it costar was about 200$ at a nice vet and about 135$ at a cheap one... Without the shots and boosters which are required here.