Ask her! She has her own desires and preferences, so she'd be able to give you much better information than I could ever provide. Understand that what turns women on mentally and what turns men on mentally are quite different. Talking to your girlfriend is really the only way you can sort this out. Plus, it's good for your relationship.
What do you think about when you masturbate or have sex? Would you tell your significant other if they asked?
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How do I get my girlfriend aroused enough to let me masturbate her?
