Touching the husband’s penis with desire invalidates her Wudu, but touching it without desire does not invalidate the Wudu. If a woman touches her husband’s penis with a barrier, her Wudu is not invalidated, even if it is with desire.

Touching the penis with desire invalidates wudu, but touching it without desire does not. Touching the buttocks does not invalidate wudu.

In order to be on the safe side and to ensure that one has discharged one’s duty it is better to do wudu in the event of the emission of wind from a woman's front passage. If this is continual and happens in all situations, then this woman should do wudu for each prayer.