I don't know how but I had adult entertainment in my weather app once, I complained to the app people they said the app itself only received weather data from them and not the adverts, for some reason they wouldn't explain where the adverts came from. I never even accessed adult sites on my mobile phone. Anyway, I eventually ended up doing a factory reset and then when I went to reinstall the backed up data eg phone contacts pictures etc, the app which had like 50,000 likes on the app store said it wouldn't recognise the backup file, so I then had to reprogram 100 numbers or so. I was a tad vexed. Luckily I had manually backed up all my pictures as I didn't want to trust the app. I do find adverts on eBay extraordinary, it must know I am male and yet displays womens clothing.I have caravan adds now. Absolutely useless adds for me because my car doesn't have a tow bar, let alone enough horse power to pull a van.