Q Doc, I have a problem which I think no other girl has. I am 19 and to be honest with you, I am really keen on sex. I think about it a lot.

But I am not one of those girls who don't care if they get pregnant. I am studying hard, and whenever I have sex with a guy, I make sure that conception will not occur!

But the problem is this, doc, I have read a lot about couples enjoying those 'great orgasms,' and discharging at the same time, and stuff like that. However, in my case I find that it is only through masturbation that I can discharge.

I am embarrassed to tell you that, doc. Please don't print my name and address because I would hate it if my mother found out that I have been masturbating.

But there is no doubt that when I 'do it' by myself, that is a sure way of discharging. I can always orgasm within 10 minutes.

Unfortunately, it is a different matter when I am with a guy. Intercourse does not make me discharge. I am aware that that is pretty normal - and that women do need the 'finger stimulation' as well, doc.

Some of the guys whom I have been with do try and do a little 'finger petting.' but it does not bring me to an orgasm.

So what is going on, doc? Am I abnormal? Or is it that the guys I have been with are too inexperienced?

A Let me begin by reassuring you that I never print anyone's name or address. And all letters are treated in strict confidence.

The second thing I should say is that it seems like you have had quite a lot of lovers for a young woman of 19. It is good that you are taking strict contraceptive precautions. But I hope you are also aware of the risk of catching a sexually-transmitted infection (including HIV).

Now, are you 'abnormal?' The answer is No.

Many females your age find that it is difficult to discharge with a man. That is particularly likely if the guy is young, inexperienced, and does not devote enough time to stimulating the clitoris. A lot of young guys are like that - because their main interest is simply in trying to discharge inside you, pretty soon.

It is a fact of life that more mature men tend to be much more aware of the needs of women. They have learned that a lot of ladies need anything up to HALF AN HOUR of clitoral stimulation if they are to get maximum pleasure.

Now in your case, you have found that when you 'do it yourself,' you need around 10 minutes stimulation. Therefore, I would say that when you are with a guy, you would need at least 10 minutes - and maybe twice that - to make you discharge.

So, really, at the moment it would be good if you could find a sensitive and caring man who would know how to use his fingertips - and who is willing to CONTINUE doing that for a good 20 minutes.

Eventually, I am sure that you will find such a guy. One final point: as you get older, you will probably find that you can discharge more quickly. By around age 30, many women can achieve orgasm within five minutes.

QI thought I would try crack/ cocaine 'just once.' To my horror, I became addicted to it immediately. I am now in treatment. But does anyone ever get better from this addiction, doc?

A. Yes, some people do. So hang on in there! However, your story is a warning to the many people who think that it will be OK if they try 'crack' just once.

QDoc, I am trying to make a career as a beauty model. But my toenails have suddenly become reall ugly and crumbling. Why?

A. Either you have a fungus infection of the nails, which is common - or you have a skin problem called 'psoriasis'. Have the toenails checked out by a doc.

QI am a young guy of 16, and I have many tiny white spots around my penis. A doctor told me these were 'Milia.' Is that serious?

A No. Vast numbers of male teenagers have these little bumps called 'milia.' They are harmless, and usually disappear as you get older.