1st, it’s not unusual for guys to lose some sensitivity as we get older, and may be a little worse
for diabetics, as I think that can cause some nerve damage. 2nd, I’m not aware of anything that could increase sensitivity - maybe someone else knows. I think the best thing you can do right now is let your partner know you can’t feel much & just say, hey, look, if I’m missing the target, just let me know & guide me to the right spot.