What is the reason for this desire that arises upon seeing children wrestle or seeing wrestling, especially upon seeing someone hold another by the neck to wrestle him to the ground, even though one does not engage in sodomy?

The advice is to consult doctors to find out the cause of the problem, and marriage is the most effective means to legitimately expend one's desires. The basic ruling on watching wrestling is permissibility if the two wrestlers are covering their 'awrah (private parts). However, one must lower the gaze from anything that arouses desire and avoid wrestling someone whose sight arouses one's desire, while striving to utilize time and energy in what is beneficial.