I'm overweight, have a receding hairline, prematurely gray, and a dick that's barely average in size (which is better than it used to be!).
I do, however, swear-to-heaven, precum a lot. For 30 years it was the most embarrassing thing. Hot scene in an R-rated movie, sprang a leak. Talk about sex, sprang a leak. Swap stories with your friends, sprang a leak. Get a hard-on while trying to maneuver a camera to take a pic of my dick?, sprang a leak.
Two things helped. First was to be dehydrated. Take a benadryl or some other antihistamine if you think you're going into a situation that might get you horned-up. Case in point. Went to a bachelor party for my cousin where each place we went was a surprise. One of those was a strip club. I was wearing white ducks (major danger) and went across the street to a bodega to get some benadryl. Dried me right up. Thank God.
Second was to double the underwear. Put on jockeys and then boxers over that. A bit warm but not too bulky and that, combined with dark pants like new jeans or corduroys hid everything. It won't stop you from that clammy wetness, but it will keep you publicly presentable.
Conversely, a few days ago I had a hook-up with a guy and it was like a tap was running. He thought it was hot. Girls think it's hot too. If you think you're going to get lucky then just go with it. Don't be ashamed of it, don't let it throw you. Women get wet and so do men. Most partners I've been with get very flattered that they can turn me on to such a degree and think it's sexy. Accept it as part of your natural sexual response.
I actually had no idea so many men wanted to have precum before I joined here. To me it was more of a hassle than something to be envied. Who knew?