Motherandbaby.co.uk has come up with a cracking use for the mobile phone - it's sending out SMS messages to wannahavebaby subscribers, suggesting when they should have sex.

(German readers, a site called Zappybaby.de offers the same service.)

It's a pity then that the messages are so lame - men are told: "Tonight's the night", while women are ordered: "It's time to get into bed."

Anyone got any better suggestions? Send in your efforts to The Register (subject: Ovulation) and we'll publish the best alternative SMS reminders. The winner will get a copy of How to solve your child's sleep problems. Alternatively, we will make a small donation to Children in Need. ®