Hi all.
It may be worth looking at this from both sides...pre bite and after bite.
With all biting insects, it is better to eat local foods, as the insects already know the smell of these (coming from your pores) are are not excited by them. Go to France, and neck down a very hot curry, and you will become an insect light house!
Feeling excited, or having sexual thoughts also attracts insects, as you become very smelly to insects in a pheromone kind of way.
So, assuming you can stop thinking about sex, it can still be hard to not be excited, particularly if you have just seen a beautiful view.
Some posters have said they are not bitten by biting insects, and this is very often due to taking medication on a constant basis, as this tastes revolting to biting insects. The average midge may as well see one of those 'poisonous' signs on a person on strong steroids for example.
So, assuming you are fairly healthy and have usual thought patterns, what is your best choice of insect repellent? I would shy away from DEET as it is a bit nasty, and also consider all commercial insect repellents to be a waste of time too (inc all the ones mentioned so far).
'Swedish aromatherapy oil' was mentioned earlier in the thread. Well there is no such thing as 'Swedish' oils, but there are some very useful aromatherapy oils indeed. If you take yourself off to your local aromatherapist, they will be able to knock you up a blend which is perfect for you (based on many factors). I would suggest that you will need four oils in a mix for this, with the price being roughly £20-25 for the cost of the oils. This will give you roughly one hundred applications, and will of course be safe to use (but don't go rubbing it in your eyes to test it lol). As for the mention of a flower oil below, it is odd, but this type of scent is often what you need. Two common oils that should be suggested to you could be: Lavender and eucalyptus oil. The other two will depend on you.
If you do take this route, buy the oils separately and then mix them (to the quantities/proportions advised), rather than buying one of the ready made ones, as these are diluted with 'carrier' oils and are not as effective.
If you are a doubter as to whether these oils work, think about two things:
DEET is only an aroma the same as oils.
Some oils are so powerful that they can kill an unborn child, purely by the mother breathing them in (which is also why i suggest seeking a proper aromatherapist to get the mix (not that any such abortive oils will be in the insect mix)).
DEET also does not last long, whereas oils come in 'top' 'middle' and 'bottom' scents depending on how long they last, so a good mix will keep acting effectively for a long period (some oils like frankincense last for a very long time, with an example being of a sample of frankincense that was taken from Tutankhamuns tomb that still smelled!!)
Having long trousers, and long sleeved tops are also a good idea, but is you are wearing shorts or a short sleeved top, then simply make/buy a cloth wrist/ankle band, and soak that with your repellent. A lot of folks will only use two bands, and will place them on opposite ankle and wrist to give a kind of shield on each side.