Top/Bottom

Slash fiction in most fandoms is heavily centered around defining the participants as either "tops" or "bottoms".

In fanfiction, the top has the penetrative role in a sexual act (both anal and oral), and the partner who adopts a dominant role in the relationship. The bottom is the receptive partner, and while not necessarily submissive in a BDSM sense, is usually portrayed as more emotionally vulnerable or fragile.

While certainly not all Slash fic complies to these roles, the majority do. Overwhelmingly Dean is portrayed as the bottom, and Sam as the top. Correspondingly it is usually Jensen who is portrayed as the bottom and Jared as the top. The introduction of Castiel and the rise of Dean/Castiel as a pairing, did disrupt this somewhat as Castiel is written in both roles, and obviously when he is written as a bottom, this puts Dean into the less usual position as top.

Some fans will include a Fic Warning for stories containing the aberrant Top!Dean or Bottom!Sammy. 

These fics will be found in all fic communtiies, but there are some specialist communities:

• Bottom Dean
• Bottom dean recs
• Bottom Sammy bottom!Sam or bottom!Jared
• Top dean and Top!Jensen comm
• Bottom Jared