"The blind leading the blind", indeed.
I remember one partner I had. We were about 35 at the time, she has been married and I was somehow experienced, yet she felt little or no pleasure: I had no idea how to "solve" her issue, and she expected me to solve it for her. An experienced man and an already married woman in their 30s, and yet we were still like fumbling kids. :-o
I have since learnt that sexuality is like a wide, huge and wild country, full of mysteries and surprises and pitfalls, and you never know it all (a bit like Australia, perhaps ;-). And most of us are not even given a lousy map of it, never mind a geography atlas.
Sure, sex is natural; but this doesn't mean we are naturally good at it, or can be master of it, without lots of time and effort.