From looking at tits?
For 5 years?
Everytime they averted their eyes and went against their natural intincts, they got stressed and probably pushed their blood pressure up (and not in a good way).
Those poor bastards.
That group was self-selected: Guys who would agree to try that for five years. Get together a representative sampling of men and at least half would never agree to be in that group. (And half the rest would agree to it, so long as they get paid, then lie about what they actually did.)