This sounds as though you might have had an epileptic fit. These are sometimes caused from flashing lights. Please see a doctor this week.

Relax. Masturbation is totally harmless to the health, whether you are male or female. And rather surprisingly, it has been shown that males who masturbate are actually less likely to get prostate cancer in later life.

First of all, could I just say to you that I think it is really unwise for a girl of 16 to have sex - particularly unprotected sex!

It is possible that you have picked up an infection from the boy you went with, though that is not certain. But I strongly advise you to see a doc this week for a check-up. He or she should be able to tell you if you have caught anything. Good luck.

Far too long! The ideal length is about three to five days.

Periods that go on for 10 days will make you anaemic. So see a doctor, to get some period-regulating treatment.

Yes, there is a chance - but not a very big one. However, the problem with the kind of petting that you are doing is that before very long you and she will decide to risk 'putting it in' for a while. And before you know it, you will be having full sex. And she will probably get pregnant. So please stop and think!

The hormonal contraceptive injection is highly effective in preventing pregnancy, but the big problem with it is its effect on the periods. In some women, the menses disappear entirely for a while. In others, the jab causes irregular bleeding, such as you have experienced.

You should certainly ask for a vaginal check-up from the doctor on March 28. But I am a little doubtful as to whether you should have a further jab on that date. Maybe your body has had enough of the hormone for the moment.

You are getting attacks of cystitis, which is inflammation of the bladder. This is very often caused from sex - particularly the rather clumsy kind of sex that tends to happen with young, inexperienced couples! What you must do now is to take a specimen of your urine to a doctor. She will have it tested, and if necessary she will prescribe you an antibiotic. She will also give you advice concerning intimate hygiene.

I am delighted to hear that you do. And it is understandable that you want to make her happy.

The term 'love play' means any kind of petting - including with the fingers. Let me first tell you three important principles:

1. Take things very GRADUALLY;

2. Be real GENTLE;

3. Use plenty of LUBRICATION.

You may not understand what I mean by 'lubrication'. Well, the fact is that when a woman's genitals are dry, any kind of rubbing may be uncomfortable - or even painful - for her. The answer is to keep everything moist.

You can do this by using your fingers to spread some of her vaginal juices over the opening of her vagina. It is also OK to put a little saliva on your finger-tips and use that for lubrication.

These days, it is also possible to buy good 'sex lubricants' - either from pharmacies or on the Internet. Do NOT use Vaseline (petroleum jelly) if you are going to employ a condom - because it can make holes in rubber !

Now, do not be in too much of a hurry to approach your young lady's vagina. Begin by doing pleasant, romantic things - like stroking her thighs, belly and breasts. Eventually, when she is feeling really relaxed you can start to stroke her vulva, which is the outside of her vagina.

After a little while, gently turn your attentions to her clitoris. If you do not know where it is, ask her to show you.

The clitoris is the female equivalent of your penis. So although it is real small, it is packed with nerve endings that give women great pleasure. Indeed, stimulating the clitoris is the main way of bringing a lady to orgasm.

I would recommend that you begin by placing a moistened finger tip next to her clitoris, and rubbing up and down gently alongside it.

After that, try putting the tip of your finger just above the clitoris - and rubbing gently from side to side. Another technique is called 'the round and round' - which basically means that you circle the clitoris with your finger tip.

Always, always be guided by what your partner wants. If she says that a particular kind of rubbing motion is good, then do it. And if she doesn't like something, then don't do it!

What I have just told you will give you a good start in the art of love play. I shall return to other helpful techniques on another occasion. I wish you well.