What is the ruling on a wife reaching climax through her husband caressing her private parts with his fingers, tongue, or the tip of his penis, whether during intercourse with penetration, or for a menstruating woman over her clothes, or for a woman who cannot reach climax in the usual way despite her husband's penis being in her vagina?

It is permissible for spouses to enjoy each other in any way, except for anal intercourse or intercourse during menstruation. Therefore, it is permissible for a husband to fondle his wife's vagina when she is not menstruating. As for oral stimulation of the vagina (cunnilingus), there is no text prohibiting it, but it goes against good manners and it is better to avoid it. It becomes impermissible if impurity mixes with saliva and reaches the throat. It is not permissible for a husband to fondle his menstruating wife's vagina with his fingers.