Need info

I have been married for 12 years to my wife wich i love alot have 3 kids and they are my life, we stared swinging 2 years ago at first she wasnt ok so i kept on inssiting... We follow thru and stared by going to swinger club we have been goong for the past 2 years but i noticed that my wife isnt really into it , and the problem is that its not that i want to be with other woman but i love to see her get pleased but eventually i dont really see her enjoy it.. I actually ask her every time if she s really enjoys it which she says yes but she hardly wants to talk about it and plus wen we play with cpls she is more into watching wat im doing i dont know if she really likes this and it has me wondering if she only does it for me? I ask her almost every time and i have told her if she wanted to stop we would anytime but she says no that she actually enjoys it...... I dont know if it me or wat but i do get turned on bad seeing her flirt or making out but even at the swinger clubs she dosent , i think we as men love our wives to be a lil slutty but i cant get that to her ..... We r young we just turn 30 got married wen we were 19 ..... Hope women can comment on this and let me know wats going on ....... I would love to have a lady in the street but a bitch in the sheet how can i do that? Thanks for taking ur time and hope to get some feedbak i appreciate it .... Btw my wife is super hot