My OH has asked me to post this question. He works away Mon-Thu and arrives home on Thursday evening. We have a babysitter we use; she is a nursery nurse who we found through a local advert.
Sometimes we go out on Thursday night - I usually contact said babysitter to arrange childcare. OH has met babysitter on a number of occasions. On Tuesday OH asks if I will ask babysitter if she will do this Thursday. My reply is - can you contact her? and send him her number.
He thinks this is not the done thing. She hasn't responded and he thinks it is because it is weird for the bloke to ask.. (she hasn't responded to me in a short time frame in the past). He also says that work colleagues have agreed it is odd for the bloke to ask, and it should be the mother arranging the childcare.