Listen, OP, and the rest of you who may or may not be totally clueless about saddles and bike fit:
You need to have not only the right *size* saddle for you, but the right *shape* saddle.
Selle Italia has a fitting system based on measurements of your body. If your thighs, for instance, are larger than the average cyclist, you need a different *shape* saddle as well as the correct width for your ischial tuberosities ("sit bones"). Otherwise you might end up sitting too far forward, placing more pressure on your perineum ("taint"), making riding painful, and making your penis go numb. You could even break a saddle that way, if it's a lightweight racing saddle.
Whatever saddle a bike comes with from the factory (or whoever you bought the bike from used) may not be the right size and shape for you. Seek out someone who actually is skilled and experienced in bike fitting, they will be able to help you find the right size and shape saddle, and get it adjusted (along with the rest of the bike) so that riding is both as comfortable and efficient as it can be. For the vast majority of all of you, you will have to have this done exaclty ONCE unless you make major changes to the bike (stem, bars, pedals, etc). It's worth the expense. Just be sure you're going to someone who actually knows what the hell they're doing, not just some salesperson in a bike shop who knows the basics, more-or-less, and DGAF whether it's really right or not. Many cycling coaches (who train racers) know how to do this; seek them out, even if they don't do it themselves they'll recommend someone who does know what they're doing.