Well it is time to start using tags not just for our sake but for people who don't want to see specific things here.
Let;s make this place better together!
I took a lot from e621 tag rules, but i will simplify it a bit since FA has a pretty limited field when it comes to tags.

1) Body type? anthro, feral, humanoid, taur, anthrofied (pokemorph, digimorph), ponified, feralized

2)Species? human, canine, feline, bovine, cervine, equine, lagomorph, rodent, avian, insect, marine (cetacean, shark), scalie (click for detailed lists)

3) Sex/gender? male, female, intersex (herm, maleherm, gynomorph, andromorph), ambiguous_gender

4) How many? solo, duo, group, zero_pictured

5) Clothing? fully_clothed, partially_clothed, skimpy, nude, bottomless, topless, underwear, open_shirt

EXTRA TAGS (if you still have space lol)
Pose / Activity / Appearance (i believe it can go as extra if you still have some space after filling up the most sensitive tags)

1) General activity (if any)? walking, running, fighting, sleeping, dancing, eating, kissing, licking

2) Posture? standing, bent_over, sitting, crouching, kneeling, all_fours, on_front, on_side, on_back, ass_up (see tag group:pose for full list)

3) Body decor? glasses, ring, necklace, bracelet, anklet, tattoo, piercing, collar, hat

4) Fur style? mane, chest_tuft, pubes

5) Hair? hair, long_hair, short_hair

6) Breasts? breasts (small_breasts, big_breasts, huge_breasts), nipples, under_boob, side_boob, teats

7) Limbs? crossed_arms, raised_arms, arms_behind_head, spread_legs, crossed_legs, raised_leg, legs_up, raised_tail, tailwag

8) Gaze? looking_at_viewer, looking_back, eye_contact, eyes_closed

9) Expression? blush, wink, smile, grin, tongue_out, naughty_face, embarrassed, happy, sad

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Sexually explicit tags (mostly examples, but you will figure out yourself by answering the questions of each number)

1) Male bits? penis, balls, sheath, knot, erection, half-erect, flaccid, humanoid_penis, equine_penis, tapering_penis, veiny_penis, uncut, circumcised
Female bits? pussy, clitoris, plump_labia, equine_pussy, canine_pussy
Other? butt, anus, puffy_anus, gaping_anus, urethra, genital_slit

2) Sex act? sex (male/female, female/female, male/male, bisexual), masturbation, handjob, footjob, fellatio, cunnilingus, vaginal_penetration, anal_penetration, threesome, foursome, orgy, gangbang, frottage, tribadism, orgasm, cum_inside

3) Sexual themes? bondage, domination, rape, rough_sex, happy_sex, presenting, internal, impregnation, bestiality, interspecies, public, exhibitionism

4) Fluids? cum, cumshot, precum, pussy_juice, pussy_ejaculation, saliva

5) Toys? dildo, vibrator, buttplug, egg_vibrator, strapon, feeldoe

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Do NOT tag

Subjective tags that express opinions. Common examples include beautiful, sexy, hot, good, crappy and most other adjectives.
Generic tags such as legs, eyes, big, image and organism.