Aha, cos getting turned on releases oxytocin! Which is the hormone that triggers the let down. That's why some women leak like mad when they orgasm. (Should this be in AO? LOL). But you don't HAVE to get turned on to get your let down happening

The LDR (let down reflex) is a conditioned response, but sometimes, like when expressing, it needs a bit of help. There are a few things you can try, you can pick and choose what works best for you. Some mums find that concentrating on anything BUT the job they're doing can help - watching TV, reading a book or mag. Anything that distracts. Other mums can sit and happily watch the milk come out. You may find it helpful to look at a photo of your baby, or think lovely things about her. Some mums like to think of a waterfall, or something similar. You could try using a heat pack on your breast before expressing. Stroking your breast gently can be helpful. If someone could give you a shoulder massage that would be great! The idea is to try and relax .

If feeding is otherwise going well for you, it's unlikely you need anything as drastic as Motilium. Or anything at all to increase your supply! Expressing is not an indicator of how much milk you're making. As Barb says, the amount a mother expresses tells her alot about how good that mum is at expressing Wise words, and so true.

The pump you're using can impact as well.

Let me know if you want any more info