When the female is fertile it is absolutely safe to ejaculate in her rectum, especially when she lays on her back. In this way the ejaculate cannot drip into the vagina. Her cervix will be slightly open during this period but when there is no ejaculate it will be safe, so the contractions at 5,50 will do no harm and will not inseminate the female.

At 5,50 the male has clear , firm and healthy contractions.. This is because the females circular muscle clamps firmly around his dickhead. The male has to built up a higher pressure to produce his ejaculate. This results in more powerful pulsations. , so more pleasure for the male.