Yes, most kinds of dating sites can be submitted. However it would be worthwhile to ensure that there are no suggestive or inappropriate pictures on the site, as this would considerably reduce the odds for the site's approval. Also, ensure that words like 'sex', 'sexual', 'sexy' or 'erotic' are not included in the titles and descriptions, as these words are easily detected, and could cause your site to be disallowed or rejected.