How to make sure it doesn't smell during sex?

Take a shower before you have sex and scrub really good.

Shower before you have sex.

There is likely to be some fragrance created during intimacy and that is normal but be sure to cleanse yourself thoroughly before you start so you won't have any embarrassment.

Shower before sex. Also practice good personal hygiene.

If your vagina(or penis) smells bad, more then just a normal body oder smell. You may have a bacterial infection. Could also be a yeast infection but that doesnt normaly cause a strong or unusual oder.

The penis and vagina would have to be removed from the persons body.