I need help.

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I feel like things in bed with my other half have changed. It feels like a routine. I want to spice things up. I don't know how to though. Like he wants to try anal and I am fine with that but I keep getting flashbacks from when a previous partner tried t

o force it on me. So we get started and I tense up quickly. I freak out and nearly start crying every time.

What can I do to spice things up?