It should be clear that though Islam prohibits lustful looking at members of the opposite sex, this act does not break one’s wudu’ (ablution) unless madhi (pre-seminal fluid) is emitted.
Sheikh Ahmad Kutty, a senior lecturer and an Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states: “There is no evidence in the authentic sources of Islam to suggest that either looking at a woman or laughing invalidates one’s wudu’. However, if you look at a woman with lust then it may cause your wudu’ to break, due to the onset of madhi.
It goes without saying that many scholars are of the view that touching a woman with desire breaks wudu’ for it is associated with madhi.”