A few womens are for pregnancy preventing goals using vaginal syringes with sol. of weal acids as milk, boric, and etc.

 Yes in sour environment sprm loosing mobility,thus of this principles are based chemical contraceptives, but by experience, effectivity for syringes are 30 percents just. Sperm having high mobility and within a few min. transfer from vagina to neck uterine,where are not staying acess for mechanical and chemical effect. But if you are right and good syringed, you can stopped mobility and wash out by flow a liquid just theirs part, other are entering in neck uterine.

Its not hope method, and non harmless, long syringes changing normal microflora for uterine, mucus membranes of an often syringe by sour sol. staying dry and tight, thus are bad feeling happening. A most hopr but less harmful is this method as interrupting sex contact, effectivity contraception having 50 percents, that male having big attention and increasing willpower on the moment, when emotional tension leading a maximum, but failures are often, in long using this method for contraception in male happening weak for sex feeling till impotence.Bad method also for preventing pregnancy as in normal sex contact as for ending uterine neck is relaxing, restoring normal blood circulation in pelvis and sex organs, when act happening without a natural ending, is displaying stable flat-blooded  for these organs, as pulling ache in sacrum and belly low, menses cycle wrong,and weak sex feeling, with neurosis signs. as irritability, sleep  bad.

And today arsenal for contraceptives are much, its a not hard to select, which would be hope and save, but with a doctor to do.  Visit both to the doctor, lissten advises and do tests! Its a for both attitude having!