Can I ask what you mean by 'affecting your performance' ?
Sure, this ol' Captain needs to stroke and caress a slim body for the 1st bit of a appointments. I need to feel the curves of the hips, firm skin around the mid rift and legs. Firm breasts not too big, just enough to cup in ones hand.
My brain is then doing it's own assessment in the background which aids the desire copulate with the female form. (a man will get pre cum without any "manual" stimulation if all good!)
I tried a porn star late last year and it did little for me as she sat on me and went full power until completion but I had to think about a previous encounter with someone to get to completion. Her comments such as yeah baby, do it, did naff all!
Turning a bloke on mentally can be as difficult as turning on a women sometimes!
If I arrive to an appointment and the EE WG has been a bit generous with her stats and she is towards a 12 rather than an 8 she has a job on her hands to forefill the contractual arrangment we make!
Hope I have explained ok?