I came across a paper cutting a saw in a newspaper a couple of years ago about Mortal and Venial sins in modern day society. Feel free to add to the list, it would help others struggling with what's right or wrong in today's world.
Involvement in occult practices, such as palm reading, tarot cards, astrology and seances.
Joining the Masons or other secret society.
Receiving Holy Communion while in a state of Mortal Sin.
Using God's name intentionally as a curse.
Seriously wishing evil upon another.
Missing Mass on a Sunday or Holy Day without a serious reason.
Requiring employees to work on a Sunday in non-essential occupations.
Using a contraceptive despite being married.
Sex before marriage.
Excessive body piercing.
Knowingly voting for someone whis is pro-abortion.
Kissing or touching another passionately for the purpose of arousal (spouses excepted).
Cohabition prior to marriage.
Failure to pray on a daily basis.
Putting TV, hobbies, sports etc. before God.
Being distracted at Mass.
Fighting with siblings.
Speaking badly about one's spouse.
Taking one's spouse for granted.
Treating adullt children like minors.
Lack of gratitude towards parents.
Stubborness without good reason.
Harbouring a grudge.
Overeating or drinking too much.
Selfishness in marital intimacy.
Looking inappropriately at others.
Telling or listening to impure or vulgar jokes or stories.
Attachment to riches or material goods.