u, j0 A9 @2 `" l3 s$ D7 F5 Y* N无论与伴侣交往多久，认为自己需要被温柔对待的女性高达百分之九。但是那些与伴侣交往年以上的男性中，只有百分之二五希望另一半能表现温柔。 / B& U! i) U. A- q w. }
9 ~0 ^+ Z* _: n+ z" R
研究报告作者、艾本德医学中心的心理学家克鲁斯曼认为，男女性欲有别，源于人类演化的差异。 0 j7 e& S/ x b+ v. J+ m
4 ?% s/ i' Y. A/ X2 t
男人不想戴绿帽，所以要维持一定的性欲。女人则不同，女性在关系刚开端时会有强烈的性欲，是为了和伴侣创建一种稳定的配对关系。一旦关系确定，女人的性欲就会降低。 . q6 U6 j! U Y. C
$ T8 w6 [2 P% ]3 M1 e克鲁斯曼说，雌性动物为了生出基因最优良的后代，会希望与不同的雄性动物交配。 " s" _1 ], X# n4 z5 f c" C. v, h* B! | ' E$ r6 q. \* x. ?* c另一方面，女人主动减少做爱的次数，也会使男人的性趣更强烈。演化心理学家费德曼认为，女性性欲直直落的根本原因应该是供需问题，「如果无限供应一种东西，它在人们眼中的价值就会降低。」 $ Z3 S" f9 x1 k$ z8 t. h9 T 9 |$ g. u1 q0 `1 E- H3 B 2 E* o0 o+ [7 _. x! g2 i2 aSecurity 'bad news for sex drive'9 X3 k* V9 C$ G J6 ^
* N8 p3 _% |. E9 X! w! t+ [9 [A woman's sex drive begins to plummet once she is in a secure relationship, according to research. 5 D7 u+ D1 C3 x, ]7 ^: M6 HResearchers from Germany found that four years into a relationship, less than half of 30-year-old women wanted regular sex. 9 R' {- l6 `8 T: Z/ S+ B( O H: S+ m1 `) o7 ]: jConversely, the team found a man's libido remained the same regardless of how long he had been in a relationship. 8 u. {4 \5 J( S; f: ]+ n& e) W
6 j! K6 |' T% ~( YWriting in the journal Human Nature, the scientists said the differences resulted from how humans had evolved. 5 C2 O: m% n: B$ V- K
: d& q& V) R [The researchers from Hamburg-Eppendorf University Hospital interviewed 530 men and women about their relationships. ) p+ v) x/ D! z. s6 f' v" m F1 |. Q: I5 R
They found 60% of 30-year-old women wanted sex "often" at the beginning of a relationship, but within four years of the relationship this figure fell to under 50%, and after 20 years it dropped to about 20%. & T0 ^, o7 |& U! t: W8 {$ w+ c
0 n. K p" @ X/ M3 E- C" o
In contrast, they found the proportion of men wanting regular sex remained at between 60-80%, regardless of how long they had been in a relationship. 0 Z8 d- \% E# U4 T& h
: x; X5 K4 N2 Z2 ~8 F9 Z
Tenderness 4 v! v" w' W/ O# {; A8 U: l- M; [8 o
2 H g* P I- `* N% ~4 Y' g
The study also revealed tenderness was important for women in a relationship. * Y+ J* }' O! T& ^3 B" a9 p" |. U
& v. I" G* [) M: `# }/ L* `About 90% of women wanted tenderness, regardless of how long they had been in a relationship, but only 25% of men who had been in a relationship for 10 years said they were still seeking tenderness from their partner. 6 {/ P* \+ m* q; z7 s- O; K 0 ]6 ~7 R/ F. a# B% G% u/ oDr Dietrich Klusmann, lead author of the study and a psychologist from Hamburg-Eppendorf University Hospital, believed the differences were down to human evolution. % u3 r* W# K% e! }. Q# H m
0 p" l0 Y+ L0 C' R! ^1 X) JHe said: "For men, a good reason their sexual motivation to remain constant would be to guard against being cuckolded by another male." , t; f9 n! F; H $ h/ K/ v1 |4 M4 xBut women, he said, have evolved to have a high sex drive when they are initially in a relationship in order to form a "pair bond" with their partner. + n% A# A% K9 m6 T# L% I" y4 n
- K! @) ^' ^& M. H8 w- g, {$ _; ^
But, once this bond is sealed a woman's sexual appetite declines, he added. 8 l2 O# T/ p3 L& x$ M! Q ; Y' U/ O; K! \; n- s2 DHe said animal behaviour studies suggest this could be because females may be diverting their sexual interest towards other men, in order to secure the best combinations of genetic material for their offspring. ; I* L, |+ J5 ?6 e3 H0 `, d0 I: j( G2 ]
Or, he said, this could be because limiting sex may boost their partner's interest in it. 5 H6 R$ t; L3 f* X
+ o& n/ X- n, E$ _Professor George Fieldman, an evolutionary psychologist from Buckinghamshire Chilterns University College, said: "These findings seem to fit in with anecdotal studies and his explanations seem plausible. 9 a1 D+ Y1 X+ s" E
& ~0 D2 V/ R3 Z9 U& C/ c
"The rational for why a woman's sex drive declines may be down to supply and demand. If something is in infinite supply, the perceived value would drop."
图片附件: [Differences in sexual appetite may be driven by evolution] sex drive.jpg (2007-3-10 15:55, 13.46 KB) / 下载次数 104 http://rs238848.rs.hosteurope.de/bbs/attachment.php?aid=247866&k=50f0184c8db546c7d2c399aea04c673c&t=1745797292&sid=8jqmge
图片附件: [Differences in sexual appetite may be driven by evolution] sex drive.jpg (2007-3-10 15:55, 13.46 KB) / 下载次数 104