Flirty answer followed by real answer if actually pressed. It’s not like it’s something you reasonably have control over anyway (I don’t consider lengthening surgery reasonable, though more power to anyone that does, it ain’t my body), outside of maybe some small gains if losing weight in your pelvis area or improving your general cardiovascular health.

Not gonna come out here and say size is totally irrelevant, but there’s lots of ways to have great sex without going around bruising women’s cervixes.