I may be totally wrong, but it seems with not being circumcised there would be issues of less sensitivity during intercourse,
The general consensus is that uncircumcised equals more sensitivity. Circumcised equals less sensitivity.
There may be instances where this is not the case, but there may also be other reasons for this. For instance, in the case you cite, it's possible that the foreskin did not fully retract, even with intercourse and so there was no direct contact with what should normally be an exposed glans. Or perhaps there was an issue with the frenulum being too tight and also preventing the foreskin from fully retracting.
However, in the main, a foreskin preserves glans sensitivity by keeping it moist and from being directly rubbed against by clothing or other parts of the body (thighs for instance depending on how one sits etc).
Without a foreskin, the glans dries out and the skin becomes harder/thicker. I believe the term is called kerotonizing (?) and since this somewhat akin to forming a scab on a wound, it's obvious it entails a loss of sensitivity.
For uncircumcised men, it is very easy - but not always pleasant - to try this out experimentally on themselves. Find a simple manner or device to keep a retracted foreskin retracted (something like a small thick elastic hairband) and then go about your daily business for as long as you can stand it. At first it will be immensely sensitive up to being actually painful. Gradually increase the time spent with a retracted foreskin and after about a week it should be possible to do so for a whole day at a time without too much discomfort. And then check out the sensitivity during this time. I assure you, it will diminish.
Sadly, only uncircumcised men can try this out on themselves and experience the results of loss of sensitivity firsthand. Those who are already circumcised, especially since birth, have no way at all of ever experiencing the difference in sensitivity. So, this means that trying to explain the differences in sensitivity between cut and uncut is far too often like talking to a brick wall. And moreover compounded by an unthinking acceptance of social customs.