Felt really sorry to hear that and yes your anger and resentment is quite natural and potent. It is for sure an evident fact, that no one can force a woman to have sex with her forcefully whether it is of any type. This is because any forceful attempt on a woman’s body is considered as rape and the law strictly does not allow it. In your case the things are a little different as your boyfriend only forced you but did not hurt you. Though you did it in utter distress but it was a kind of consensual sex only.Things could have been different if he had assaulted your body on your refusal. To avoid any kind of miss happenings with you in future you need to be a little stronger and have to make it clear to your boyfriend that you are not up for everything that he desires for and certainly not by force. To give the answer of your query about sexually transmitted diseases while doing oral sex, you should know that sexually transmitted diseases only spread when there is a meeting of the male and female genitals that is the penis and the vagina. There is absolutely no chance for sexually transmitted diseasesto be spread through oral ejaculation of penis. A woman’s vagina is the solebearer of any kind of sexual disease and they are not spread until a male penis is inserted in it. As for the infection part, yes there could be infections if the genitals are not properly cleaned without doing any kind of sex, be it conventional sex or the oral one. Same thing can be said for anal sex. The side effects of this type of sex can be seen on a woman’s face as it can develop pimples and her digestive system may develop some infection. Therefore it is advisable to do it with a condom as it acts as protective shield for any kind of infection. I think you have got an extended answer to your query, wish you luck for the rest of your life and always have healthy sex.