At first, the male grips the females back and humps awaynothing unusual about it.
Its called the copulatory tie, and the dog really doesnt have much of a choice about it.
His penis is literally locked inside his mates vagina.
Also, hes still ejaculating.
The lock is the result of a combination of penile inflation and vaginal squeeze.
Only after hes inside her does the glans tissue expand, and expand, and expand.
The most impressive expansion occurs in an area at the base of the glans called the bulbus glandis.
Hes not going anywhere until her muscles relax and his tissues deflate.
But no one really knows why they do it.
Best guess so far?
But why that should happen butt-to-butt rather than belly-to-back is still a mystery.
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