The sex appeal shows as 49% but it is irrelevant, all the girlfriends (which sex appeal is only for anyway) will still date CJ.
Also, Sex Appeal is not a static statistic like your cycling, driving, weapons, etc. Sex Appeal in San Andreas is maximized, by default, by collecting all 50 Oysters, BUT it operates on a sliding scale and is constantly in-flux, influenced by the clothing items you have on (for instance, certain sunglasses give you 2 0r 3% when wearing' certain pants give you 5% to 10%, etc.) as well as the last vehicle you were in when you check the stat. So if you are dressed in all the right clothes and accessories, are driving around in a high end sportscar, luxury vehicle, sexy cycle, or Low Rider, you will max out your Sex Appeal at that moment.
Caution: Crashing up your vehicle reduces all the sex appeal that vehicle gave you, so if you want to max out the stat, have collected all the Oysters, and are wearing nice clothes and driving a nice ride, just take the vehicle to the Pay 'n' Spray and that will repair it and boost your sex appeal.