Yes, kissing one's spouse is considered halal (permissible) in Islam after marriage. It's viewed as a loving act that strengthens the marital bond. The Prophet Muhammad (peace be upon him) himself engaged in this practice with his wives.
Different Interpretations & Considerations
While the consensus is that kissing within the marital relationship is permissible, some nuances exist:
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Privacy: Public displays of affection, including kissing, are generally discouraged. Many Islamic scholars emphasize the importance of maintaining modesty and privacy in intimate expressions. Kissing should be confined to the privacy of the marital home. [Several Quora and Reddit threads highlight this point](https://www.quora.com/Are-Muslim-people-forbidden-to-kiss-after-marriage, https://www.reddit.com/r/MuslimMarriage/comments/ephwxy/is_kissing_in_public_haram, https://islamqa.info/en/answers/72220/is-it-prohibited-to-kiss-your-wife-in-public).
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Type of Kiss: The type of kiss is also a consideration. While a tender kiss between spouses is generally acceptable, any overly explicit or immodest displays are discouraged.
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Premarital Kissing: It's crucial to note that kissing before marriage is strictly prohibited (haram) in Islam. This aligns with the broader Islamic teachings on premarital intimacy. [Several sources emphasize this distinction](https://www.reddit.com/r/Muslim/comments/1dl390a/can_muslims_kiss_before_marriage/, https://www.quora.com/Is-kissing-my-wifes-lips-allowed-in-Islam).
In summary: Kissing between spouses after marriage is permissible within the confines of privacy and modesty, and is even seen as a positive act to foster love and intimacy within the marriage. However, public displays of affection and any immodest behavior are discouraged.