don't use WD40 or 3 in 1 LOL Too much grease is worse then none at all btw. You might consider checking out the specs on "Super Lube 92003 Silicone Lubricating Grease with PTFE Teflon" Home Depot has it. Safe for rubber, plastics.
Condoms are latex, not rubber... I'm not sure if vaseline screws rubber tho... just pointing that out