Can I use coconut oil or lotion with condoms?

Not with latex condoms. Oil-based products, including coconut oil, body lotion and petroleum jelly, can weaken latex and make it more likely to break. Stick to water-based or silicone-based lubes with latex. Polyurethane and nitrile condoms are compatible with oil, but oil can be harder to wash out and some people find it irritating, so water-based lube is the easiest all-rounder.