Durex and other lubricants causes irritations for me so I don't use them always.
I use KY every single day and it never caused me any irritations (Itching, redness etc....), the only cons of it is that it dries very fast, so I suggest you bring a glass of water with you to apply some drops when it dried instead of applying your own saliva, it is great for edging for hours.
Olive oil is a great Penis Enlargement Exercises (PEE) Lubricant, it heats your dick and makes the penis skin healthy, Amazingly I noticed that it reduces the sensitivity of the penis tip (temporary, only when applied) which reduces the stimulation when masturbating or getting sucked, It is long lasting but hard to clean, It has no chemicals what so ever, the best of the best.