Is passionate kissing often a near occasion of sin (for the unmarried)? Do you think an unmarried couple can engage in this activity without actually sinning? What is your opinion?
Such can yes be quite sinful.
Examination of Conscience:
“Did I engage in acts such as …“necking,” passionate kisses, or prolonged embraces?”
From the Handbook of Prayers. Edited by Fr. Jim Socias Midwest Theological Forum (quoted by the Catholic News Agency)