Yes; I was conceding that I've never had sex with someone who has an IUD, only talked to them. You'd have to ask nekitamo what exactly one should learn from having sex with someone who has an IUD.
As someone who has sex on a regular basis with (one) woman who has an IUD, my experience has been that it has no impact whatsoever if installed properly. The uterus (where an IUD lives, naturally) is not typically involved in the act of sex.