LOL is surprisingly a really good movie. It's pretty educational for the kids - lightly covering the topics of sex, drinking, drugs, and smoking. There is actually a school lecture in the movie about how drugs damage the brain.
LOL depicts the common complexities of a mother-daughter relationship, divorce, and relationships in general. My 13-year-old daughter was the perfect age for this movie because she understood the terms used and was able to gain sex ed. The sex parts of the movie are not, however, too thoroughly detailed or anything, so there's nothing to fear. She loved the movie and so did I. It does have some pretty funny moments and is very relatable. They don't use too much language, just the occasional "h*e," "sl*t," "wh*re," "sh*t," and "a--hole." "B*tch" is used maybe once or twice. But this is expected because most teen-based movies have a little language here and there, but it's not what the movie revolves around. This movie also covers friendship and sexuality. It's definitely not too inappropriate for 13+ though, so I see no need to not let your 13+ kids see this movie. Kids 13+ should know about these topics already and will be able to enjoy the movie like my daughter and I did.
It's also great to use as a guideline for 'The Talk' if you haven't already had it or just don't want to.
You should watch it!