It is narrated from Umm al-Mu'mineen Sayyidah Umm Salamah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) used to kiss while in the state of fasting.
Hadith Referenceالسنن المأثورة / باب صيام من أصبح جنبا / 299
Hadith Takhrijصحیح بخارى، الحيض ، باب النوم مع الحائض، رقم : 322