more simple 3 reasons exist.
1)
Especialy "in lunch" times very short.
Ramen shop staff hopes "fast eat,fast out" all customers.
Women not good at eating fast,if do noise very louder XD
So slow eater not fit as Ramen shop styles.
Ramen shop kitchen everyday changing to battle field.
BC near area a lot of business competitors.
Also "eating fast(not enough chewing) make fat" as common knowledge XD
2)
Most Ramen shop build small space and simple layout tables/counter and seats tight.
Women dont like "sharing a table(ex 1vs3/unknown men)"
and "too close" neighbors style.
Women hope to as "relax" space anytime just not fit.
3)
High Cal(for diet) and smells not for good work/life stlyle after lunch corect.
But basically mixed soup kinds foods(also pasta/curry) jumped irregularly when sucking in if hard more damages.
So women really not hope clothes,hair and face make becoming soiled with soup oils.
Just loves "keep clean" whole day when outside.
Young women care too much about what others think of them usual and anytime.
Most women "loves" any kind noodles(Soba/Udon,hot/cold)
but thinking "not need" as lunch menu :D
Recent years "Tsuke-men(soup for dipping)" type lovers very hot.
http://youtu.be/QktA9Xfm4-A