Can paragard copper IUD can affect my sex drive?

No. The copper iud does not emit hormones and so will not have an effect on your sex drive. It functions as a foreign body to block implantation of the fertilized egg. So, it should not have an effect on your sex drive.
No effect. The CopperIUD is one of the BEST forms of birth control available. Non-hormonal (no effect on fertility/acne/headaches/nausea/wt gain/bloating/blood clots) and VERY safe (except if you have Wilson's dz/Copper allergy). Only risk is a heavier period and complications w/ insertion (RARE). Immediately effective to prevent pregnancy, but DOES NOT protect against STIs. OK for women who haven't had kids.