MC usually appears within a few weeks of exposure and clears up within a few months. Therefore, passage of a year since your last outside sexual exposure effectively exonerates you as the source. You didn't get it at the gym. MC is most common in young children. Probably your wife acquired your son's infection, despite her care with hygiene; or maybe another child, if for example she has been in close contact with friends' children, especially toddlers.
Given this event and your extramarital adventures, it makes sense for you to have standard STD testing: a urine test for gonorrhea and chlamydia and a blood test for HIV and syphilis. They'll probably be positive, but better safe than sorry.
As for MC itself, don't be worried. It's a trivial condition with no complications.
Son is 9 and My wife and I are both 37. I've never had any type of lesion, bumps or abnormality in the pubic area- and I've been on the lookout. My wife has very good hygiene and is super careful, but I really dont think this came from me. The question then is how could she have gotten it.. Also-
Could I have had the virus with no symptoms then passed it along to her?
Also- if it was from my- I haven't been with anyone else in a long time. Almost a year.. I assume if I got it and passed it along that I got it at the gym or from contact with my kids etc. is that plausible?
When molluscum contagiosum occurs in adults, especially in the pubic area, it usually is sexually acquired. However, there may be exceptions, especially if there is potential exposure in the household, in particular to a young child with MC. And it seems unlikely your wife caught the infection from you, if you haven't had typical MC lesions in your genital area.
How old is your son? And how old are you and your wife? Also, I can judge your STD risk better with more information about your extramarital sexual contacts -- nature of partner(s) and exposures, when most recently, etc.
For some reason my profile lists me as a female, but I'm obviously a male. Any thoughts?