We allow our HS sr son a cell phone, w/understanding no texts are private. We saw texts w/HS soph girl who said she's had sex and wanted him, etc. He was very willing, as never dated. We discussed with him, told him our views, respect women, only w/in marriage, etc. We later allowed him to go on date w/her, but made him go on proper date - dinner and a movie (he wanted to "hang" out at her house, we we said no). We're sick about this now, as they both want to continue and we're not sure how to stop the train. What can / do we do? P.S. we've had many prob's w/him lying to us - cell phone taken away last 3 weeks.