I understand that wudu is invalidated if you touch your private parts. Is this also applicable when after a bath one applies some cream or oil on the buttocks? Does that also invalidate the wudhu? Or if your hand accidentally touches the front part?
Putting cream over the buttocks does not affect wudu. Shaikh Ibn Al-Uthaymeen says that touching the private parts does not affect wudu except if it is with lust. Other Scholars say it breaks Wudu.