Your position is usually determined by leg clearance. Your legs have to fit in front of the wings. When a saddle is too wide for a person, they may end up TOO much in the front.
Nevertheless anyone might end up further in the front than they might expect, so long as they sit with a forward (anterior) tilted pelvis (such as 75 degrees). On many saddles, the only way to fully utilize the platform in the back is to ride with backward (posterior) pelvis tilt. The pelvis position on the saddle does not change objectively, but the part that is low and touching the saddle changes: It's either ramus (front of pelvis) or tuberosity (back of plevis). In the worst case it would be the pubic bone (most frontal part). With a neutrally tilted pelvis (say 85 degree), the tuberosity just touches the frontal marginal zone of the t-shaped wing. But with posterior pelvis tilt (say 95 degree), the tuberosity may move a bit deeper into the wing.
Btw: Pelvis tlt degrees are counter-intuitively labeled like this: upright is 90, horizontally forward is zero.
Some saddles have a ramp in the back and demand that you ride in very tilted pelvis position, sitting fully on that ramp. If you just refuse to go into this angle, you may end up in front of it, with upright pelvis. But then the saddle will be noticably too narrow for you. Unless your saddle was designed or a much bigger person.
Your pelvis tilt is determined by the handle bar position but also individual habits of how you relate torso and pelvis, for example bloating, indigestion, bodyfat, gall stones, enlarged spleen or liver will inspire ppl to maintain anterior pelvis tilt relative to the torso. When the handlebar forces the torso into a forward angle, the pelvis will then be extremely angled, on the ramus (its okay) or possibly on the pubic bone (trouble). That means pressure is in the middle (may be okay on some v-shaped saddles) of the saddle or on the nose (bad).
