The Boar Mate spray is brilliant, particularly for fine tuning the timing. When they are ready to be serviced, one short spray and they will stand statue-like still for 15 minutes with moving a whisker or blinking. If you use the spray too early or too late, they take no notice and seem to find it slightly annoying. In addition to checking the state of the vulva each day, the other critical test is pressure on the back. When they stand still to this that is the time to try the Boar Mate spray. Best of luck - Tamsaddle