Yes, but for some reason, sexual urges- being a feeling that humans get in order to reproduce- seem incredibly unlikely since Yuki was never, you know, human. I mean, was such a capability- of having pleasure from contact with the genitals- even programmed in her being? I mean, she could program it herself, but she would need to have some sort of consciousness of its existence, or else she would never even think of it. Sort of like how small boys would think sex is icky until they grow up and find their penises popping up every time they see someone attractive; they don't understand the appeal until they start being plagued by the feeling themselves.
Also, sure, you could say she could have simple recreational or purely-for-love sex, but that would be such a HUGE show of affection... I mean, she just learned how to serve other people dinner.
It just seems like the last thing she would do.