Don't think it's that bad.
http://news.bbcimg.co.uk/media/images/59149000/jpg/_59149626_59149568.jpg
http://www.insidehboboxing.com/storage/091512-martinez-chavez-580.jpg?__SQUARESPACE_CACHEVERSION=1347774269024
http://3morerounds.com/wp-content/uploads/2011/10/Martinez_Barker-300x172.jpg
During fights his trunks tend to slide down a little and at times the protector will raise (mainly at the back), but it tends to be fixed.