
I don't really have one so I'm not sure, but I did notice when I have romantic feelings for someone, I tend to become less focused with my life and a lot of my thoughts and attention become shifted to trying to find out ways I can help my crush or the person I am dating be happier, remembering nice moments we shared, or imagining us hanging out/talking
Most Men struggle to multi-task (wide generalization it developed as a childcare skill) and men often have arousals that kicks up, in very short order (seconds), so it can definitely become difficult to properly continue a train of thought when your sufficiently aroused. Women have a lot longer of a warm up period, but a deeper response too.