Chastity and orgasm denial discussion

This is the cage my boyfriend uses. I am his key holder, I want to make sure that this is safe, he’ll wear it for about 8 hours during the day at work, -and then when he gets home from work, I tell him he’s been good all day and that he can remove it so we can play. I read a few threads on line of people who can no longer come or get an erection because of this device. I already have infertility problems because my ovaries don’t produce big enough eggs- the last thing I want is for him not to be able to ejaculate or get hard, family planning is definitely in the future