http://www.mangago.me/read-manga/kanojo_ni_naru_hi/
not only gender bender, it's also 1 of the BEST shoujo.
http://www.mangago.me/read-manga/kanojo_ni_naru_hi_another/
related to the 1st one I mentioned but it's different from it.
http://www.mangago.me/read-manga/boku_girl/
it's seinen. but I am still mentioning it because it's the bestest BEST gender bender manga I have read so far & it also has lots of shoujo moment ;)
http://www.mangago.me/read-manga/tennen_paaru_pink/
Adorable, fluffy, cute.
http://www.mangago.me/read-manga/biyaku_cafe/
ONLY the 1st couple's story.
http://www.mangago.me/read-manga/udagawachou_de_mattete_yo/
http://www.mangago.me/read-manga/nise_x_koi_boyfriend/
http://www.mangago.me/read-manga/wagamama_na_jewel/
http://www.mangago.me/read-manga/motto_aishiaimasho/
http://www.mangago.me/read-manga/bijo_tokidoki_yajuu/
http://www.mangago.me/read-manga/goshujinsama_ni_kiwotsukete/
BL:
http://www.mangago.me/read-manga/hanayome_wa_juunanasai/
http://www.mangago.me/read-manga/nise_x_koi_boyfriend/
http://www.mangago.me/read-manga/ayashi_kazokukeikaku/
gotta love Dr. Ten!!
http://www.mangago.me/read-manga/stop_goshujinsama/
this ones shotacon, pretty porny & borderline hentai. So avoid this, if it's not up your ally.
shoujo
http://www.mangago.me/read-manga/usotsuki_lily/
http://www.mangago.me/read-manga/he_s_dedicated_to_roses/
http://www.mangago.me/read-manga/idol_shopping/
http://www.mangago.me/read-manga/penguin_revolution/
http://www.mangago.me/read-manga/tokyo_crazy_paradise/
http://www.mangago.me/read-manga/teppen/
http://www.mangago.me/read-manga/hana_no_kishi/
http://www.mangago.me/read-manga/extrastrous/
http://www.mangago.me/read-manga/houou_gakuen_misoragumi/
http://www.mangago.me/read-manga/power/
http://www.mangago.me/read-manga/hana_kimi/
http://www.mangago.me/read-manga/uwasa_no_midori_kun/
http://www.mangago.me/read-manga/samurai_high_school/
http://www.mangago.me/read-manga/savage_garden/
http://www.mangago.me/read-manga/w_juliet/
http://www.mangago.me/read-manga/tenshi_ja_nai/
BL
http://www.mangago.me/read-manga/himitsu_no_akuma_chan/
http://www.mangago.me/read-manga/secret_araya_miki/
http://www.mangago.me/read-manga/henshin_dekinai/
http://www.mangago.me/read-manga/kasougenjitsu_ren_airon/
http://www.mangago.me/read-manga/shounen_oujo/
One of my favorites (gender bend)
Can anyone recommend me any manga about traps or gender bend?? It can be Yaoi or shoujo~ thank you