Swearing does not break your wudu, but it is recommended for the one who commits a sin to do wudu because wudu expiates for sins, as is proven from the Prophet (peace and blessings be upon him).

Imam al-Shafi`i was of the view that vomiting does not break wudu and this is the correct view because there is no sound evidence to show that vomiting breaks wudu.

If you make Wudu, this Wudu cannot be ruled invalid unless there is certainty that what invalidates Wudu has occurred. If you are uncertain as to whether your sleep was deep or not, then your Wudu is not invalidated thereby.

If a man touches a woman with desire, this breaks his wudu, whether the woman is a non-mahram or otherwise. The kind of touching which breaks wudu is physical touching with no barrier in between.