He becomes a kemonomimi boy in the new world after orgasming 
 
A nameless 40-year-old single man loses consciousness from masturbating too much and thinks he has lived his life to the fullest, but when he regains consciousness he sees a cute girl with a worried look on her face in front of him. Her name is Misha, and she calls the man Norun. According to Misha, he had nearly drowned in the river. The man does not understand what is happening, but what he sees reflected in the water is the image of a cute boy with animal ears. The man is reincarnated into another world and becomes a person called Norun. The inhabitants of this world have animal ears and tails, there are more females than males, and it is a polygamous society. And Misha is the girl who will become Norun's first wife. Although they are not yet married, Misha lives with Norun, and does not hesitate to take off her clothes and take a bath with Norun. As Misha washes Norun's body, his crotch begins to swell more and more. 
 
(Source: Getchu, translated)

Our protagonist is a 40 year old male virgin. Normally, he masturbates up to 10 times while looking at photos from the idol meet and greet events he goes to but upon the 12th time he dies of a technobreak and finds himself reincarnated in another world.
 
In this new world, the gender ratio skews heavily towards females to the point that they make up most of the workforce. Not to mention everyone has animal ears! Another interesting fact is that males only go into heat once a year but Norun, as our protagonist is known as, carries a gift that allows him to go into heat at will. With this discovery, what adventures (and pleasures) will Norun experience in this new world?
 
(Source: Denpasoft)
 

Soushuuhen Vol. 1 (2019/12/30)
 1-4. Boku no Risou no Isekai Seikatsu 1-4 (ボクの理想の異世界生活) 
 5. IMIX16.5 
 6. Micro Bikini Mishia to Ichaicha Suru Hon (マイクロビキニミーシアといちゃいちゃするほん) 
 7. Nekomimi Shoujo Kansatsu Kiroku (猫耳少女観察記録) 
 8. Kakioroshi 4-Kan Osoto Ecchi ~Kitaku Kono Aida No Ohanashi Desu (描きおろし 4巻お外えっち~帰宅 この間のお話です) 
 
Soushuuhen Vol. 2 (2021/08/14)
 1-4. Boku no Risou no Isekai Seikatsu 5-7 (ボクの理想の異世界生活) 
 5. Boku no Risou no Isekai Seikatsu 5 Omake Hon (ボクの理想の異世界生活5おまけ本) 
 6. Miko Chise to Ichaicha Suru Hon (巫女チセといちゃいちゃするほん) 
 7. Bunny Lovemea to Ichaicha Suru Hon (バニーラビメアといちゃいちゃするほん) 
 8. Kakioroshi Sono 1, Kakioroshi Sono 2 (描きおろしその1, 描きおろしその2)
 
Soushuuhen Vol. 3 (2023/12/31)
 1-4. Boku no Risou no Isekai Seikatsu 8-11 (ボクの理想の異世界生活) 
 5. Lovemea to Osoto Ichaicha Suru Hon (ラビメアとお外でいちゃいちゃするほん) 
 6. Kakioroshi Micro Bikini mo Cha to Shinya no Kouen de (描きおろし マイクロビキニのチャと深夜の公園で・・・) 

 
Notes: Chapter count includes 10 extra chapters from the soushuuhen releases and “Boku no Risou no Isekai Seikatsu 6.5."

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