Is it dangerous if his foreskin breaks and he bleeds in you?

Yes, unless you are 100% sure that he is free of STIs (sexually transmitted infections). HIV is transmitted through direct contact with blood or semen and HIV can enter the body through mucous linings, such as the eyes, mouth, nose, vagina, rectum or penis.

Remember that even if you ask your partner if he or she has been tested for STIs you are taking their Word for it. Unless you are in a sexually exclusive relationship where both parties have been tested for STIs including HIV at the beginning there is no way to guarantee that you are having "safe" sex if you do not use a condom.

You should always use a condom with new partners or partners who's sexual history you are unsure of.