Why Can’t I Stop Fantasizing About My Girlfriend With My Friend After a Harmless Game?

Dear Dr. Sitara,

I’m a 27-year-old man, and recently, something happened that I just can’t seem to shake. My girlfriend and I were at a party playing a drinking game with friends—one of those classic truth-or-dare setups. At one point, she was dared to kiss one of my closest friends. She immediately refused, saying it crossed a line, even when the group (being drunk and reckless) kept pushing. Eventually, they backed off, and the game continued like nothing happened.

Logically, I know she did everything right. She set a boundary, respected our relationship, and didn’t cave to peer pressure. But ever since that night, I can’t get the thought out of my head. The idea of her kissing my friend has taken root in my mind, and instead of fading, it’s evolved into something more consuming.

Now, whenever I see her, especially when we’re intimate, I don’t just admire her body—I imagine how my friend would admire her. I picture him grabbing her waist, kissing her deeply, or pinning her against the shower wall. It’s intrusive, almost obsessive. What’s worse is that these thoughts have started fueling my arousal. When we have sex, I picture myself as my friend, taking her behind my own back, as if I’m the one betraying myself. It’s confusing, embarrassing, and completely unexpected.

I don’t know what to do about these feelings. Part of me wonders if I should just ignore them and let them fade over time. Another part thinks I should talk to her, but what would I even say? It feels ridiculous to bring this up when she technically did nothing wrong. Should I try to process this on my own, confront the issue, or find a way to work these thoughts into our relationship in a healthy way? I don’t know how to handle this, but I need to do something before it completely takes over my mind.

First, I want you to take a step back and ask yourself—have you ever had thoughts like this before, or is this the first time something like this has consumed your mind? If this is a completely new experience for you, I’d advise giving it a few weeks before making any big decisions. Sexual fantasies can be incredibly powerful, but they don’t always reflect a deeper desire that needs to be acted on. Sometimes, intrusive thoughts arise from a mix of jealousy, curiosity, and subconscious arousal triggers, but they lose their intensity over time. If the fantasy naturally fades, then it was likely just a momentary fixation brought on by the circumstances of that night.

However, if you find that the thought of your girlfriend with your friend doesn’t go away, or even intensifies, you need to consider whether this fantasy is something you genuinely want to explore further. If the idea excites you, rather than simply distressing you, then it may point to a deeper aspect of your sexuality—one that leans toward voyeurism, cuckold fantasies, or a general attraction to power dynamics involving your partner.

Should you decide you want to explore this in your relationship, how you bring it up is critical. You absolutely should not dump the full weight of your thoughts on your girlfriend all at once. She didn’t actually kiss your friend, so if you were to suddenly confess that you can’t stop picturing them together, it may come across as confusing, or worse, make her feel like you’re accusing her of something. Instead, start subtly by reinforcing your attraction to her. Compliment her body in a way that acknowledges her sexuality—something like, “I love looking at you. You’re so sexy, and I love knowing other men find you attractive too.” This gently introduces the idea of viewing her through someone else’s eyes without making it about your friend directly.

From there, gauge her response. If she engages in the conversation, you can take small steps toward discussing attraction—who she finds attractive, whether she’s ever felt a spark with someone else, or even if she enjoys the idea of being desired by other men. If she seems uncomfortable or dismissive, then it’s a sign that this may not be something she is open to exploring. If she shows curiosity, however, you can slowly introduce the idea that thinking about her in that way turns you on—again, without immediately tying it to your friend.

If you realize that this fantasy is more than just a fleeting thought and becomes something that consistently arouses you, you have options. You can keep it as a private fantasy and use it as a mental stimulant during intimacy, or if your girlfriend is open to it, you can explore roleplay, discussions of attraction, or even controlled forms of non-monogamy. But all of this depends on her comfort level. The worst thing you can do is force the conversation too aggressively, making her feel scrutinized or uncomfortable.

You’re not alone in this—many men have experienced similar unexpected arousal from thoughts of their partner with someone else. What matters is how you choose to process and act on these feelings. Whether you let them pass, integrate them into your sex life in a subtle way, or explore them openly with your partner, it’s crucial to communicate carefully, respect her boundaries, and most importantly, ensure that whatever path you take enhances your relationship rather than damaging it.