The performed presence
The friction tends to arrive when sex itself becomes another performance. Coordinating, communicating, checking in mid-act, slowing down to “be present” — in releasing, all of these can feel like the day has followed the body into the bedroom. The work-mind doesn't get to log off; it just changes uniforms.
What helps
"You don't have to talk about it first. I'm here." "Let's just be in the body." What helps: a partner who can meet the urgency without slowing it down to make sure it's “really intimacy.” The slowing-down is sometimes exactly what the body was trying to escape. Some nights are the conversation the body is having with itself, and your partner is there to be present without making the night also be about something else.