The only thing that would lead someone to think of sex in what you posted is that it's found in Craigslist. I sold an old mountain bike and some backpacking equipment on there, but some of those personal ads are pretty wild. Some of those folks can sexualize anything---and I mean anything.
A typical ad: "Trek Mountain Bike for Sale"
Response: "Show me some pics and lets make this happen
Me: "Sure, here are five pictures of the bike, notice the scratches on the frame."
Response: "Now get on that bike naked and let's really make this happen. Pics please."
You live and learn Lost. Go work out consistently and you'll see others doing the same and ask them to spot you occasionally if you are lifting weights. Before you know it, you will get to know others at the gym who can be of help. Join a class where you are put in with others who are getting back into shape.
Just a few thoughts…