Inverted nipples - vintage ladies from 1910s to 1990s

When I see all these charming women of the past and their inverted nipples so beautiful, I am always happy to understand, that playing with nipples in this way is perhaps old like all our human kind! If only women were not so shy and at least confess, that they like doing this. And if not regularly, so at least they tried to do it sometimes... Why can we only read about some ritual initiation at some African tribes and nothing else?nWhat a turn on to see these beautiful nipples as they are modified this way!