Nhung thong tin ve cai ay luon lam cho cac nang phai nguong ngung khi muon hoi tham. Chinh vi vay ma trong cuon “Men Are Pigs, But We Love Bacon”, Michael Alvear, phong vien kha noi tieng ve linh vuc tinh duc da dua ra nhung cau tra loi thang than nhat ve van de nay.
Theo nhung nha san xuat bao cao su thi chi co 6% cac quy ong can nhung chiec “ao mua” rong hon. Noi mot cach khac la co den 94% cac anh con lai deu da noi doi ve kich co cua minh.
Cac bac si chuyen khoa tiet nieu cho biet chieu dai trung binh cua"cai ay" khi cuong cung la 15 cm. Doi khi, co mot so chang lai boc phet la "cau nho" co the tang len gan 2 lan so voi binh thuong.
Khong co su tuong dong nao giua kich thuoc cua “cuc cung” voi so giay, ngon tay hay chiec mui.
Chi can uong qua nhieu la “thangem” se eo la ngay. Chinh vi vay ma thu con lai duy nhat trong nha co the “dung thang” khi nguoi dan ong say khuot tro ve la cai may hut bui.
Dung mong doi co the lam cho “anh chang ti hon" hung dung hon ma hay tan dung nhung gi ban dang co. Kich thuoc cua no chi co the phat trien khong ngung nghi khi nguoi dan ong o giai doan U20 ma thoi.