Hello There
well its actualy very simple. the "charedi" pepole, like you called them, have sex exactly like an ordinary pepole... there is no unique technique that can be ascribed for the way they have sex... actualy- there are very open minded "charedim", that have sex in all kind of variations, and make their sex life even more daring then the most chilonim... there are several prejudices that claimant the "charedim" have sex with a sheet covering the female body and only a little hole in her vagina area so the male will be able to penetrate... exc. exc. its all a bunch of crap... so... rest your mind, your journey toward "our" world will be easyer then you expacted all you need to do is to flow, the waves will guide you to the longing shore salam aleicum and shavua tov