I know there's some people on here who have know a bit about animal behaviour... We got our male cat…

I know there's some people on here who have know a bit about animal behaviour... We got our male cat neutered and female cat spayed about 3 weeks ago now, before getting them done our male cat did actually mount our female (ooopes) and even though he's been done he still tries to mount her when they play but obviously she isn't interested... what do I do?