I posted this as a response to another post about lubrication, but was intending to start a thread myself as I have had a few concerns lately.

Basically over the past couple of weeks masturbating has become less pleasurable I think it may be down to the use of lube. I should point out that I am uncircumcised.
I always used to use a regular moisturising lotion: E45 cream, just under the foreskin to provide a bit of lubrication between the head and the foreskin.
A bout 6 months ago I decided to try out proper lubes and have been using ID Millenium Lube since. At first I found the amount of lubrication provided was great, better than what I was using before, but recently I have found masturbating has become less pleasurable. I'm guessing its down to the lube as I've never had any problems over the past 15 years or so, I switch to a lube and now jerking off just isn't the same.
I don't know whether using lube on a daily basis is in any way harmful, but it seems like I need more and more lube to acheive the same level of lubrication. I'm sure I've read that there are natural oils produced by the body and in particular around the head of the penis. I wouldn't say the head of my dick has become dry, just seems to be lacking any moisture at all.
Also, and this sounds weirder than it actually is, but I'm wondering if the shape of my dick is actually changing, it kind of feels like my foreskin has got tighter around the head of my dick, not tight as in I can't pull it back, just when I'm jerking off instead of the foreskin running back and forth over the head, its not sliding propery, as i said earlier, it feels like there's not enough lubrication, but i think its just the foreskin rolling up on itself rather than the head of my dick, if that makes any sense?

As with most problems in this area, I guess the only real way to resolve them is to just have a break from jacking off. Anyone had any similar experiences over the years?