Actually, amateur wrestling rules consider "grasping or holding the opponent's genitals" or "attacking genitals" to be illegal moves: see Amateur wrestling. Wikipedia.
However, in women's wrestling such moves are not as harmful or painful as in men's wrestling.
In fact, holding an oppenent between his/her legs by your arms or legs is a good leverage for effectively controlling the opponment's body.
Ali Bernard (red) throws Katie Downing (blue) in the 72kg Championship match during the USA Olympic trials for Wrestling and Judo on June 13, 2008 at the Thomas and Mack Center in Las Vegas, Neveda. (Photo by Jonathan Ferrey/Getty Images) Twin Cities
Russia's Lubov Volosova (blue) fights with Poland's Monika Ewa Michalik for the bronze medal on the Women's 63Kg Greco-Roman wrestling at the ExCel venue during the London 2012 Olympic Games August 8, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: OLYMPICS SPORT WRESTLING) Alamy
Russia's Inna Trazhukova (red) and Poland's Monika Ewa Michalik fight in their women's -63kg freestyle wrestling (WFS) bronze medal bout.
The Rio 2016 Summer Olympic Games. Michalik won the bout. Photo by Stanislav Krasilnikov/TASS Alamy
Sweden's Sofia Mattsson technically outclasses Katarzyna Krawczyk of Poland to take Women's 55kg Freestyle Wrestling Gold. European Games. June 2015 United World Wrestling Press
India's Sakshi Malik (top) and Aisuluu Tynybekova of Kyrgyzstan. Match for the Bronze medal in the 58kg category. Rio Olympic Games. 2016 News18
Clarissa Chunl (blue) turns Alyssa Lampe (red) during the womens 48kg finals match at Carver Hawkeye Arena. April 2012
Credit: Reese Strickland-US PRESSWIRE.
Photo from Olympic Wrestling 2016
Poland's Monika Ewa Michalik (red) wrestling with Russia's Inna Trazhukova in their women's 63kg freestyle bronze medal match in Rio Olympics. August 2016 After the match her trainer Mikhail Mamiashvili punched her in the face twice for losing Bronze.
Top: Photo by Laurent Kalfala. Getty Images
Bottom: Phto from Kasjauns
Yulia Ratkevich of Azerbaidzhan and Taybe Yusein of Bulgaria at the European Games in Baku. Category 60kg. July 2015 United World Wrestling
Kaitlyn Prigortzke defeated Teeshe Seon in the female 73kg class final. Saskatchewan High School wrestling championship. March 2014
Photo by Derek Montensen. Star Phoenix
Stavroula Zygouri of Greek against Sara Eriksson of Sweden wrestle in the category 63kg. Athens Olympics, August 2004 SportIt
Leigh Jaynes at the world team wrestling trials. 2012
Photo by Larry Slater. SmugMug
Canada's Tonya Verbeek (right) against France's Anna Gomis. AThen's Olympic's classification match in Madrid. March 2004 Getty Images
Ida-Theres Karlsson of Sweden in the World WRESTLING Championship. Guangzhou. 2006. Category 55 Kg Bertil Tomelius' Blog
Hitomi Obara of Japan (blue) competes against Maroi Mezien of Tunesia (red) in the Women's Freestyle 48 kg Wrestling.
The London 2012 Olympic Games. August 8, 2012. London, UK.
Photo by Lars Baron/Getty Images Europe. Zimbio
Japan's Kyoko Hamaguchi (blue) fights with US Ali Bernard during their women's 72kg freestyle bronze medal wrestling match at the 2008 Beijing Olympic Games on August 17, 2008.
Photos by Toshifumi Hitamura. 24
From videoclip "Best of Women's Freestyle". Published on Feb 23, 2013. YouTube
Anna Polovneva of Russia (red) and Ludmila Cristea of Moldova compete at the women's 59kg Freestyle wrestling bronze medal match at the European Wrestling Championship in Belgrade March 7, 2012.
Photo by Srdjan Stevanovic. Getty Images
Valeria Chepsarakova (Russia) defeats Daria Leskina (Russia), in the finals at 48kg.
Alexander Medved Prizes international wrestling tournament. Minsk, Belarus, March 2015
United World Wrestling
Brazel Marquez vs Rachelle Spurlock. 130Lbs category.
2012 Women's College Wrestling tournament, California, December, 2012.
Photo by Tony Rotundo. WrestlersAre Warriors
Yuliya Ratkevich (red) of Azerbaijan and Tetyana Lavrenchuk of Ukraine compete in the women's freestyle 59kg bronze medal match of the 2013 FILA Wrestling World Championships in Budapest, Hungary, on Sept. 19, 2013.
Xinhua/Attila Volgyi. Xinhua
Brazil's Aline da Silva (red) and Japan's Rio Watari (blue) stay at it in fierce twisting
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China's Zhong Xuechun pins down North Korea's Jong Myong-Suk in a painful-looking move.
Reuters. Daily Mail
Japan's Kaori Icho (red) competes with Tunisia's Marwa Amri (blue) in their women's wrestling 58kg freestyle qualification match at the Rio 2016 Olympic Games
AFP Getty Images. Daily Mail
Kaori Icho (blue) of Japan vs. Alena Kartashova of Russia at the Women's 63kg wrestling. 2008 Beijing Olympic Games
AFP Getty Images. CasaFree
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