Can I use ice cubes to improve oral sex?

I see that in several messages and answers, that reference is made to oral sex accompanied by the use of ice cubes. I'm pretty ignorant about this and would be very grateful to you if you would tell me more about this. My boyfriend and I have a very good sex life and we enjoy making love, but we're also on the look-out for new things to try. I've asked my friends about this and some of them thought it was a joke! Thanks for the help.


Do I have urethritis or something else?

My boyfriend has had pain during urination and ejaculation. We have been only with each other for the past year and neither of us have STIs. The info I have found on the internet makes me believe maybe he has urethritis. My question is, can you cause damage to the urethra during oral sex? I don't want to get too personal, so I will leave it alone, but I want to know, can you cause damage due to any force to the urethral opening?