Sure, here are some examples of how to use the slang meaning of "rubber" as a condom in sentences:

• He always carries a rubber in his wallet, just in case he meets someone he wants to hook up with.
• The health clinic was giving out free rubbers to promote safe sex and prevent the spread of STIs.
• She asked him if he had a rubber, and when he said yes, she felt more comfortable having sex with him.
• It's important to use a rubber every time you have sex, even if you're on other forms of birth control.
• He forgot to use a rubber during sex and now he's worried he might have contracted an STI.