What is the cause for itching of face and chest after sex?

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Is this the first time this has happened or every time? Are there any rashes or just itching?

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There can be multiple causes to this problem. A detailed history will rule out the cause.

1. Vibratory urticaria: Due to the movements during sex.
2. Cholinergic urticaria : Due to heat generated during sexual activity. Such people also have hives after heavy exercise.
3. Allergy to semen or latex in the condom: Again this is something you can rule out with history.

You can get her tested for any allergy and get tests done accordingly to confirm the diagnosis. For now, you can get her started on a combination of tablets Ranitidine and Loratadine daily to avoid another episode of the same.