excellent post. hands on the neck is very arousing for both players. the dom feels power and control over the life of his victim. depending on individual anatomy, some guys will pass out from this when the carotid arteries are firmly compressed for a few minutes. in rare occasions, the arteries can be damaged causing stroke or death. a little squeeze can assist intensity without killing or damaging the partner.
compressing the neck below the voice box blocks breathing. this can be fun to create gasping and wheezing sounds.