Yes, a French kiss is halal in Islam after marriage.
Based on the reference, all kinds of kisses are allowed between husbands and wives in Islam, including French kisses. The reference states: "French kiss, Arab kiss, Malay kiss, Indian kiss, Chinese kiss, basically all kinds of kisses is allowed between husbands and wives in Islam."
This indicates there is no restriction on the type of kissing permitted within a marriage in Islamic teachings.
Therefore, a French kiss, along with other forms of kissing, is considered permissible and lawful within the marital relationship according to this understanding.
