The copper iud?

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what are your guys experiences with the copper IUD(paragard)? i was thinking about getting that. 
can your man cum in you? will he feel it in you? is it a reliable bc? 
then again he doesn't want me on anything. i told him what the IUD offers and he is like "arent you worried about infections or it slipping out of place?" well yeah but we currently do the pull out and it's been fine for the last 6 months. we are careful using the pull out method but i think it's time we are safer.