Porn searches point to my website

Someone recently conducted a search and came to my site. My site was number one in the results and came back as follows:

# Free Nude Milf Thumbs
Ronaldo Naked. F***ing Indian Women. Big Black Woman Sexe. Selfsuck Teen. Latina Abuse Rhiannon. Fhm Lesbians. Requiem For A Dream Sex. Liz Stewart …
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There is no adult content on my site. Has someone hacked my blog? I can’t seem to find anything with keywords like this anywhere. The search engine directs to my main page. I’m at a complete loss as to why my site would come up with these results.