Dangerous oral sex?

I am having a physical relationship with a girl in my neighbourhood since abt 2 years...

we never had sex thought we have foreplay!
and foreplay means only foreplay no sex(no penetration or insertion)
I excite her with my fingers and she does the same...

to my penis until I climax.

but some time ago...I told her jokingly to take my penis in her mouth and she did so for abt 20 strokes.They say your mind doesnt work when your penis does.now I have read somewhere that having oral sex will not cause pregnancy but is very dangerous in terms of th transmission of STDs or rater infections!
I have nil knowledge of all this STDs and cant even talk to my parents.

so please guide me in this problem and help me guys and gals if you can to the earliest!
thinking you in advance
GMB

Ok I will start with this keeping yourself clean wont stop you from getting a StD!!! Protecton will!!! If you never had vaginal sex you might be ok!!! You should ask the girl has she been having sex with anybody other than you because if she iz having oral se with sumbody else she can catch sumthing in her mouth in give it to you!!! Use a condom when havin oral sex ... you shouldnt be havin sex at all if you don't nkw what you are doin!!! It iz really easy to catch sumthin out here these days!!

I've been doing oral for a lonnnggg time and
I've never had an std or infection.
as long as you clean yourself,there shouldnt be an infection(:

soo chillout

I dont believe you're 21 like your profile says!!
How old is the girl your messing around with??

***as long as you clean yourself,there shouldnt be an infection(:***
explain how diseases in the blood stream can be affected by washing

Christ some people on this website are so naive if you clean yourself, there shouldn't be an infection, errr that only would stop something like a UTI, which, by the way, isn't an STI.
Right the only way you can protect against STIs is using a condom. You can carry some STIs in you're mouth from oral but if she went down on you it's more likely that she would be the one getting the STI.
You can be born with STIs but it's not very common...the only common ones that you are born with are HIV/AIDS and hepaptitis as they are blood-born. Most (but not herpes-this can also be caught by kissing as well) can only be caught by performing oral sex, vaginal sex, or anal sex.
There are various STIs, some are curable, and most don't have any symptoms for most people but can cause infertility (like gonnorrhea and chlamydia. I'll give you a website with all the STIs, how you catch them, what the symptoms are, how they are diagnosed, and how they are treated. It also gives you information on where to get free condoms and testing in the UK.
As soon as you are sexually active (so giving/getting oral, having vaginal or anal sex) then you need to get an STI and you must do this everytime you have a new sexual partner etc. You can get checked up in GUM clinics and some GPs may do tests.
Hope this helps x
http://www.condomessentialwear.co.uk/stis-stds