Random links being generated on posts

Random links to viagra sites are being placed in posts on my site.

Here is the link that shows it on one of the post:
https://reachforthewall.com/2013/09/16/guarding-young-swimmers-from-sexual-abuse/

It appears in multiple posts on the site.

The html looks like this: //<p>USA Swimming also is adopting a more proactive media effort, closing loopholes in its code of conduct and possibly setting up an independent third canada pharmacy viagra party to adjudicate complaints about sexual abuse. Robert Allard, a California attorney who represented Ms. Currin and other swimmers who have been victimized, discounted the group’s efforts as window-dressing aimed at convincing Congress to back off. Mr. Wielgus said the measures are not prompted by congressional scrutiny but have been under discussion for several years.</p>//

I have also found instances of text referencing viagra in <div> text and in <p title=”viagra canada”> that does not appear on the site.