Even if humans once advertised ovulation in this way, it appears that we don't anymore. Hilariously, it's thought our early ancestors once gave out this involuntary signal for optimal fertility but evolution has since "dampened" it down. Results showed that redness varied significantly across the ovulatory cycle, peaking at ovulation and remaining high during the latter stages of the cycle after oestrogen levels have fallen. A new British study suggested subtle changes in skin colour may be behind this and found women's faces do increase in redness during ovulation. The hotties on this list of Hollywood's hottest men and the most attractive male celebrities in the world just have that impact. Pick your own line-up of hottest, cute famous guys and use it to re-rank this list. Though many of these hot famous guys are young and known for driving teenage girls wild Zac Efron, Ian Somerhalder, and Chace Crawford all rank pretty well , it's interesting to note the variation in age on any list of handsome men.