Make Alt.com cobrands where you host the front and link to cobrand join page. This way you can design it however you want targeting exactly the niche you want.
Steps:
1. on main welcome page create alt.com cobrand.
2. Under setup your url choose option b for use your own domain but use a sub domain like dating.yourdomain.com.
3. On main yourdomain.com host your own front end dating design.
4. Link everything on yourdomain.com to the join page of the sub domain cobrand. So basically host the tour on the main domain and link to cobrand join page on the sub domain.
Following this method you can build an army of niche cobrands tailored to your traffic sources branding your own domains.
Good luck
