am I cheating?

I've been grappling with something that's been weighing heavily on my mind, and I'm hoping I'm not alone in this. Lately, during intimate moments with my husband, my thoughts drift to other men. Wanna hear worse? That "other men" is his second cousin. We met couple weeks ago when he visited us in Singapore. Unmarried, his face is my type. Personality is my type. It's not something I ever anticipated, and it's causing me a lot of distress. I want to be fully present with my husband, but these intrusive thoughts keep creeping in. Is this normal?