Invasion of the Bee Girls - 1973 (DVD) - UK Seller

From IMDB: In the small town of Peckham, California, many men die for excessive effort during sexual intercourse. When a scientist from the Brandt research laboratory is found dead in a motel, the government sends Agent Neil Agar (William Smith) to investigate the mysterious deaths. He suspects that the deaths may be related to some experiments of Dr. Susan Harris (Anitra Ford), who is researching bees in the Brandt facility. Written by Claudio Carvalho, Rio de Janeiro, Brazil