Someone asked Rav Bentzion Mutzafi how he can get started in giving shiurim to women. He was looking for direction. It was not even a halachic question - just saying what he intended to do and asking for some direction.
Rav Mutzafi responded that it is completely prohibited for a male lecturer to lecture in front of women, and he is a sinner for doing so, as the Torah says "do not stray..and after your eyes". They should have a female lecturer who will prepare a week in advance with midrashim, mussar, and words of Chazal, and she should present them to the women.
source: Rav Mutzafi's ask the rabbi page, question #132480
I don't think this needs any further comment...
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