The following is Quora's policy on adding images and videos to answers, posts, comments, topic pages, user profiles, and other areas of the site:
Adult Media
Adult images and videos (including graphic violence and sex-related media) are only allowed on adult Spaces and pages involving adult topics and which have been tagged with the appropriate Quora Adult topic(s) (e.g., Specific Types of Adult Content, Sex and/or other topics). This will limit the distribution to users who have actively opted in to seeing such content.
Because user profile pictures, Space icons/cover photos, and topic images appear throughout the site, sex-related image content is not permitted in these areas.
Graphic Violence
Images and videos of extreme graphic violence (or links to such images/videos) are only allowed if (1) they are clearly helpful and necessary to the answer, and (2) they do not glorify violence. Questions that specifically ask for pictures of graphic violence must have the Adult Content on Quora topic tag applied.