What is the ruling on a woman masturbating if her husband is traveling and unable to return, while imagining he is with her, and does the ruling differ if she does not imagine that?

Masturbation is forbidden, whether a woman imagines her husband or someone else. However, if you fear falling into adultery, the sin of masturbation is lesser, as it involves committing the lighter of two evils. Your husband is obligated to keep you chaste, and it is not permissible for him to be absent from you for more than six months without your permission and consent.