Can I take a poll?

I would like to take a poll!  All you women who have an IUD (I'm going to be getting one soon) and who use a cup (I'm trying to figure out what cup to buy, I've never used one) which cup do you use?  I've heard that Lunette is really good, but I wanted to find out what everyone prefers.
Also, have you tried having sex with your cup in?  Someone told me that you can't have sex with any of the cups except Instead.
Thank you bunches!