Not unless (a) they have an STD and (b) you have unprotected sex with them. Boils are most often caused by staph aureus, a bacteria that's normally found on the skin. While sexual activity can cause exchange of the skin's resident bacteria, including staph and MRSA, boils themselves aren't normally considered contagious.
Yes! Most girls get them. Is it big? Then it's called a boil. A boil is caused by a messed up hair follicle. Look up boils for more information.
No
Yes. Assuming that they knew or should have known they had the STD before they had unprotected / unsafe sexual practices with you.
Because having a STD compromises the immune system which will allow the virus to transfer more easily.
Only if someone who has a STD used it before you for masturbation for instance and then you use it while their fluids are still on it. Vegetables don't carry STD's unless we put it on there. Same goes for other food items, furniture, cars etc.
It is an STD that you can get from having too much anal sex with someone who has chlamydia.
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it's like having sex with clothes on, except without STD or STI
You can catch one, or the other, or both.
"Boil brained" is not a common phrase in English. It may be a variation of "boil-brained," which could be interpreted to mean someone who is easily agitated or hot-headed. However, without more context it is difficult to determine the exact meaning.
Colonists do blood and sacrifice someone then boil it to make candles.
Yes that is what the term STD (sexualy transmited disease) refers to.