Why Muslim man cannot sit beside Muslim women in a Mosque what is the main reason ?

Its because that Muslim men cannot control themself. Men and women can sit side by side in a church and nothing fishy or molesting happen .
Update: even though some girl wearing sexy clothes although it's actually not allowed we as a men do not switch our attention to the girl but concentrate on what the father has to said. Unless that person have are cheecky that can't be blame.
Update 2: even though some girl wearing sexy clothes although it's actually not allowed we as a men do not switch our attention to the girl but concentrate on what the father has to said. Unless that person have are cheecky that can't be blame.
Update 3: how about if the person is gay or lesbian
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