Heats will increase in frequency and intensity until the cat gets what hormones are telling her she wants.... Now my cats may be weird, but when I had a pair of sisters that I could not afford to immediately spay my others (all fixed) would help out the girls. Admittedly the ex-toms would at first be thrilled and then hide in the basement since their desire to "play" was less, but I found the other females tended their unaltered colony mates and the heats passed off ok.
It is not the best solution, but it worked until money was in tune. My vet just laughed about the fact that my colony was very loving and indeed even now though all are fixed, there is still the occassional "play" session.
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