Is it permissible for a wife to prevent her husband from caressing her anally or sucking his penis, fearing penetration or apprehension of sin?

It is forbidden to have anal intercourse with one's wife. However, it is permissible for the husband to derive pleasure from between her buttocks without penetration. Nevertheless, intercourse between the buttocks is disliked (makruh) because it might lead to anal penetration. Therefore, the wife is not allowed to prevent her husband from enjoying what is between her buttocks if she is certain that penetration will not occur. But, if she predominantly believes that the husband will use this as a pretext for anal intercourse, then she must prevent him. As for the wife sucking the husband's penis, it is contrary to what is preferable (khilaf al-awla), but it is permissible if the wife consents and is certain not to swallow any impurities. She cannot be compelled to do so.