Touching a Woman does not invalidate Wudhu'

Question :

What is the Islamic ruling on a man touching a woman who is Ajnabiyyah, without any kind of barrier, does it invalidate his Wudhu' or not? And what does the term Ajnabiyyah mean?

Answer:

Touching a woman does not invalidate Wudhu' in any circumstances, according to the most authoritative opinion of the scholars. This is because it has been authentically reported from the Prophet that he used to kiss some of his wives, and then he would pray, without performing Wudhu'.A woman should not shake hands with any man who is not a Mahram for her, just as a man should not shake hands with a woman for whom he is not a Mahram, based upon the saying of the Prophet:

«Verily, I do not shake hands with women. and what has been authentically reported from 'A'ishah, may Allah be pleased with her, that the Prophet used to accept the pledges of allegiance from women in words only; she said: "And no woman's hand ever touched his hand." And Allah, the Most High says:
Indeed, in the Messenger of Allah (Muhammad) you have a good example to follow.

Also, women shaking hands with men and men shaking hands with women whom they are not closely Mahram for is a cause of Fitnah for all. And the Islamic law which is perfect, prevents all things which lead to that which Allah has forbidden.

From the above, it is clear that the Ajnabiyyah woman is one whom it is not forbidden for him to marry due to kinship or any other legal reason this is the Ajnabiyyah. As for the one whom he cannot marry due to ties of kinship, such as his mother, his sister, his aunt, or any other legal constraint, such as breastfeeding or relationship by marriage, she is not an Ajnabiyyah. And with Allah is success.

Source:
Ibn Baz
Fatawa Islamiyah, Vol. 2 Pages 45-46